2017
08.31

EDIT 2017-09-07 : created a script here that will do this autmogaically for you. Read on for full write up of how to do this.

Sup all

just as the name implies this article is a howto on using android tablets as external monitors.

at the time of writing, here are my specs / what was used / needed:
Done on a laptop running:
Linux (Gentoo Base System 2.4.1 64bit / Linux 4.12.9)
xrandr --version
xrandr program version 1.5.0
Server reports RandR version 1.5
----
Tablet 1:
-Nexus 10
--Android 6.0.1 (LineageOS version 13.0-20170729-NIGHTLY-manta)
--Resolution 2560 x 1600
--bVNC Free
----
Tablet 2:
-Nexus 7
--Android 7.1.2 (LineageOS version 14.1-20170822-NIGHTLY-flo)
--Resolution 1920 x 1200
--bVNC Free

All this done over wifi so it is a little laggy but does get the job done.

If you are planning on only using one tablet then you can stop after Tablet 1 and just read the cleanup section to stop / cleanup.

You can substitute tablets as long as you make sure that you get your resolutions proper.

Before we begin, here is a shot of both tablets working together:

Click image to enlarge


Tablet 1

First things first, here is my running xrandr before configuring (i will be posting a copy of xrandr after every step so it will be kind of long):

% xrandr                                                         
Screen 0: minimum 8 x 8, current 2560 x 1600, maximum 32767 x 32767
eDP1 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 290mm x 180mm
   2560x1600     59.97*+
   2048x1536     60.00  
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   1920x1200     60.00  
   1600x1200     60.00  
   1680x1050     60.00  
   1400x1050     59.98  
   1280x1024     60.02  
   1400x900      60.00  
   1280x960      60.00  
   1280x800      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
VIRTUAL2 disconnected (normal left inverted right x axis y axis)
VIRTUAL3 disconnected (normal left inverted right x axis y axis)

we will use VIRTUAL1 for tablet 1 and eDP1 is my existing monitor.

we need to use cvt which calculates VESA CVT mode lines for the resolution of tablet 1 which will go to the left of eDP1

# 2560x1600 59.99 Hz (CVT 4.10MA) hsync: 99.46 kHz; pclk: 348.50 MHz
Modeline "2560x1600_60.00"  348.50  2560 2760 3032 3504  1600 1603 1609 1658 -hsync +vsync

the part we will be using from this is :

"2560x1600_60.00"  348.50  2560 2760 3032 3504  1600 1603 1609 1658 -hsync +vsync

so lets create the new mode:

xrandr --newmode "2560x1600_60.00"  348.50  2560 2760 3032 3504  1600 1603 1609 1658 -hsync +vsync

xrandr should look similar to this now:

% xrandr
Screen 0: minimum 8 x 8, current 2560 x 1600, maximum 32767 x 32767
eDP1 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 290mm x 180mm
   2560x1600     59.97*+
   2048x1536     60.00  
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   1920x1200     60.00  
   1600x1200     60.00  
   1680x1050     60.00  
   1400x1050     59.98  
   1280x1024     60.02  
   1400x900      60.00  
   1280x960      60.00  
   1280x800      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                              
VIRTUAL2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                              
VIRTUAL3 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                              
  2560x1600_60.00 (0x16e) 348.500MHz -HSync +VSync                                                                                                                                                                                                                                                                            
        h: width  2560 start 2760 end 3032 total 3504 skew    0 clock  99.46KHz                                                                                                                                                                                                                                               
        v: height 1600 start 1603 end 1609 total 1658           clock  59.99Hz

so now we need to add mode VIRTUAL1:
xrandr --addmode VIRTUAL1 "2560x1600_60.00"

which makes xrandr look like:

% xrandr                                                                                                                                                                                                                                                                                                        
Screen 0: minimum 8 x 8, current 2560 x 1600, maximum 32767 x 32767                                                                                                                                                                                                                                                           
eDP1 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 290mm x 180mm                                                                                                                                                                                                                                 
   2560x1600     59.97*+                                                                                                                                                                                                                                                                                                      
   2048x1536     60.00                                                                                                                                                                                                                                                                                                        
   1920x1440     60.00                                                                                                                                                                                                                                                                                                        
   1856x1392     60.01                                                                                                                                                                                                                                                                                                        
   1792x1344     60.01                                                                                                                                                                                                                                                                                                        
   1920x1200     60.00                                                                                                                                                                                                                                                                                                        
   1600x1200     60.00                                                                                                                                                                                                                                                                                                        
   1680x1050     60.00                                                                                                                                                                                                                                                                                                        
   1400x1050     59.98                                                                                                                                                                                                                                                                                                        
   1280x1024     60.02                                                                                                                                                                                                                                                                                                        
   1400x900      60.00                                                                                                                                                                                                                                                                                                        
   1280x960      60.00                                                                                                                                                                                                                                                                                                        
   1280x800      60.00                                                                                                                                                                                                                                                                                                        
   1024x768      60.00                                                                                                                                                                                                                                                                                                        
   800x600       60.32    56.25                                                                                                                                                                                                                                                                                               
   640x480       59.94                                                                                                                                                                                                                                                                                                        
DP1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
DP2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
HDMI1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
HDMI2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
VIRTUAL1 connected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
   2560x1600_60.00  59.99                                                                                                                                                                                                                                                                                                     
VIRTUAL2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                              
VIRTUAL3 disconnected (normal left inverted right x axis y axis)

now we have to set the mode:
xrandr --auto --output VIRTUAL1 --mode "2560x1600_60.00" --left-of eDP1

which makes xrandr look like:

% xrandr                                                                                                                                                                                                                                                                                                        
Screen 0: minimum 8 x 8, current 5120 x 1600, maximum 32767 x 32767                                                                                                                                                                                                                                                           
eDP1 connected primary 2560x1600+2560+0 (normal left inverted right x axis y axis) 290mm x 180mm                                                                                                                                                                                                                              
   2560x1600     59.97*+                                                                                                                                                                                                                                                                                                      
   2048x1536     60.00                                                                                                                                                                                                                                                                                                        
   1920x1440     60.00                                                                                                                                                                                                                                                                                                        
   1856x1392     60.01                                                                                                                                                                                                                                                                                                        
   1792x1344     60.01                                                                                                                                                                                                                                                                                                        
   1920x1200     60.00                                                                                                                                                                                                                                                                                                        
   1600x1200     60.00                                                                                                                                                                                                                                                                                                        
   1680x1050     60.00                                                                                                                                                                                                                                                                                                        
   1400x1050     59.98                                                                                                                                                                                                                                                                                                        
   1280x1024     60.02                                                                                                                                                                                                                                                                                                        
   1400x900      60.00                                                                                                                                                                                                                                                                                                        
   1280x960      60.00                                                                                                                                                                                                                                                                                                        
   1280x800      60.00                                                                                                                                                                                                                                                                                                        
   1024x768      60.00                                                                                                                                                                                                                                                                                                        
   800x600       60.32    56.25                                                                                                                                                                                                                                                                                               
   640x480       59.94                                                                                                                                                                                                                                                                                                        
DP1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
DP2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
HDMI1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
HDMI2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
VIRTUAL1 connected 2560x1600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm                                                                                                                                                                                                                                         
   2560x1600_60.00  59.99*                                                                                                                                                                                                                                                                                                    
VIRTUAL2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                              
VIRTUAL3 disconnected (normal left inverted right x axis y axis)

at this point if it worked you will notice that your screens will get wonky for a second until the x11vnc server is started and connected to:

x11vnc -display :0 -clip 2560x1600+0+0 -rfbport 5900

now open bVNC on tablet 1
change:
Keep Screen Awake
Force Landscape Orientation
-- under Advanced Settings:
View-only mode

Connection Type : UltraVNC
Port : 5900

Now connect to your machine and you should be good to go.

If you are only doing one table you can end here and look at the cleanup section on how to clean this up.
For a second tablet, just keep reading.


Tablet 2

so first lets run cvt with the second tablets resolution so we can get the proper modelines:

% cvt 1920 1200                                                                                                                                                                                                                                                                                                 
# 1920x1200 59.88 Hz (CVT 2.30MA) hsync: 74.56 kHz; pclk: 193.25 MHz                                                                                                                                                                                                                                                          
Modeline "1920x1200_60.00"  193.25  1920 2056 2256 2592  1200 1203 1209 1245 -hsync +vsync

we will be using:

"1920x1200_60.00"  193.25  1920 2056 2256 2592  1200 1203 1209 1245 -hsync +vsync

so lets create the new mode:

xrandr --newmode "1920x1200_60.00"  193.25  1920 2056 2256 2592  1200 1203 1209 1245 -hsync +vsync

xrandr should look similar to this:

% xrandr                                                                                                                                                                                                                                                                                                        
Screen 0: minimum 8 x 8, current 5120 x 1600, maximum 32767 x 32767                                                                                                                                                                                                                                                           
eDP1 connected primary 2560x1600+2560+0 (normal left inverted right x axis y axis) 290mm x 180mm                                                                                                                                                                                                                              
   2560x1600     59.97*+                                                                                                                                                                                                                                                                                                      
   2048x1536     60.00                                                                                                                                                                                                                                                                                                        
   1920x1440     60.00                                                                                                                                                                                                                                                                                                        
   1856x1392     60.01                                                                                                                                                                                                                                                                                                        
   1792x1344     60.01                                                                                                                                                                                                                                                                                                        
   1920x1200     60.00                                                                                                                                                                                                                                                                                                        
   1600x1200     60.00                                                                                                                                                                                                                                                                                                        
   1680x1050     60.00                                                                                                                                                                                                                                                                                                        
   1400x1050     59.98                                                                                                                                                                                                                                                                                                        
   1280x1024     60.02                                                                                                                                                                                                                                                                                                        
   1400x900      60.00                                                                                                                                                                                                                                                                                                        
   1280x960      60.00                                                                                                                                                                                                                                                                                                        
   1280x800      60.00                                                                                                                                                                                                                                                                                                        
   1024x768      60.00                                                                                                                                                                                                                                                                                                        
   800x600       60.32    56.25                                                                                                                                                                                                                                                                                               
   640x480       59.94                                                                                                                                                                                                                                                                                                        
DP1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
DP2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
HDMI1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
HDMI2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
VIRTUAL1 connected 2560x1600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm                                                                                                                                                                                                                                         
   2560x1600_60.00  59.99*                                                                                                                                                                                                                                                                                                    
VIRTUAL2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                              
VIRTUAL3 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                              
  1920x1200_60.00 (0x16f) 193.250MHz -HSync +VSync                                                                                                                                                                                                                                                                            
        h: width  1920 start 2056 end 2256 total 2592 skew    0 clock  74.56KHz                                                                                                                                                                                                                                               
        v: height 1200 start 1203 end 1209 total 1245           clock  59.88Hz

now lets add the new mode (we will use VIRTUAL2 for this):
xrandr --addmode VIRTUAL2 "1920x1200_60.00"

xrandr should look like this now:

% xrandr                                                                                                                                                                                                                                                                                                        
Screen 0: minimum 8 x 8, current 5120 x 1600, maximum 32767 x 32767                                                                                                                                                                                                                                                           
eDP1 connected primary 2560x1600+2560+0 (normal left inverted right x axis y axis) 290mm x 180mm                                                                                                                                                                                                                              
   2560x1600     59.97*+                                                                                                                                                                                                                                                                                                      
   2048x1536     60.00                                                                                                                                                                                                                                                                                                        
   1920x1440     60.00                                                                                                                                                                                                                                                                                                        
   1856x1392     60.01                                                                                                                                                                                                                                                                                                        
   1792x1344     60.01                                                                                                                                                                                                                                                                                                        
   1920x1200     60.00                                                                                                                                                                                                                                                                                                        
   1600x1200     60.00                                                                                                                                                                                                                                                                                                        
   1680x1050     60.00                                                                                                                                                                                                                                                                                                        
   1400x1050     59.98                                                                                                                                                                                                                                                                                                        
   1280x1024     60.02                                                                                                                                                                                                                                                                                                        
   1400x900      60.00                                                                                                                                                                                                                                                                                                        
   1280x960      60.00                                                                                                                                                                                                                                                                                                        
   1280x800      60.00                                                                                                                                                                                                                                                                                                        
   1024x768      60.00                                                                                                                                                                                                                                                                                                        
   800x600       60.32    56.25                                                                                                                                                                                                                                                                                               
   640x480       59.94                                                                                                                                                                                                                                                                                                        
DP1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
DP2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
HDMI1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
HDMI2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
VIRTUAL1 connected 2560x1600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm                                                                                                                                                                                                                                         
   2560x1600_60.00  59.99*                                                                                                                                                                                                                                                                                                    
VIRTUAL2 connected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
   1920x1200_60.00  59.88                                                                                                                                                                                                                                                                                                     
VIRTUAL3 disconnected (normal left inverted right x axis y axis)

now let set the mode:
xrandr --auto --output VIRTUAL2 --mode "1920x1200_60.00" --right-of eDP1

now xrandr should look similar to this:

% xrandr                                                                                                                                                                                                                                                                                                        
Screen 0: minimum 8 x 8, current 7040 x 1600, maximum 32767 x 32767                                                                                                                                                                                                                                                           
eDP1 connected primary 2560x1600+2560+0 (normal left inverted right x axis y axis) 290mm x 180mm                                                                                                                                                                                                                              
   2560x1600     59.97*+                                                                                                                                                                                                                                                                                                      
   2048x1536     60.00                                                                                                                                                                                                                                                                                                        
   1920x1440     60.00                                                                                                                                                                                                                                                                                                        
   1856x1392     60.01                                                                                                                                                                                                                                                                                                        
   1792x1344     60.01                                                                                                                                                                                                                                                                                                        
   1920x1200     60.00                                                                                                                                                                                                                                                                                                        
   1600x1200     60.00                                                                                                                                                                                                                                                                                                        
   1680x1050     60.00                                                                                                                                                                                                                                                                                                        
   1400x1050     59.98                                                                                                                                                                                                                                                                                                        
   1280x1024     60.02                                                                                                                                                                                                                                                                                                        
   1400x900      60.00                                                                                                                                                                                                                                                                                                        
   1280x960      60.00                                                                                                                                                                                                                                                                                                        
   1280x800      60.00                                                                                                                                                                                                                                                                                                        
   1024x768      60.00                                                                                                                                                                                                                                                                                                        
   800x600       60.32    56.25                                                                                                                                                                                                                                                                                               
   640x480       59.94                                                                                                                                                                                                                                                                                                        
DP1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
DP2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
HDMI1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
HDMI2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
VIRTUAL1 connected 2560x1600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm                                                                                                                                                                                                                                         
   2560x1600_60.00  59.99*                                                                                                                                                                                                                                                                                                    
VIRTUAL2 connected 1920x1200+5120+0 (normal left inverted right x axis y axis) 0mm x 0mm                                                                                                                                                                                                                                      
   1920x1200_60.00  59.88*                                                                                                                                                                                                                                                                                                    
VIRTUAL3 disconnected (normal left inverted right x axis y axis)

now is where it gets a little tricky. before we start the second vnc server client we need to take two things into consideration:
1) the total existing resolution right now is horizontal resolution is 2560 + 2560
2) the vnc port for the second tablet has to be different from the first

so lets start the second vnc server like so:

x11vnc -display :0 -clip 1920x1200+5120+0 -rfbport 5901

on tablet 2, we set the same settings as in tablet 1 except for the port which we will use 5901 for. if you see the clip line you will notice that it is set to the resolution of the table except for the beginning offset which is set to 5120 (2560 x 2)

and voila!! should have a working multi tablet system...

now to cleanup


Cleanup

at this point your xrandr should look similar to this:

% xrandr                                                         
Screen 0: minimum 8 x 8, current 7040 x 1600, maximum 32767 x 32767            
eDP1 connected primary 2560x1600+2560+0 (normal left inverted right x axis y axis) 290mm x 180mm                                                               
   2560x1600     59.97*+                                                       
   2048x1536     60.00                                                         
   1920x1440     60.00                                                         
   1856x1392     60.01                                                         
   1792x1344     60.01                                                         
   1920x1200     60.00                                                         
   1600x1200     60.00                                                         
   1680x1050     60.00                                                         
   1400x1050     59.98                                                         
   1280x1024     60.02                                                         
   1400x900      60.00                                                         
   1280x960      60.00                                                         
   1280x800      60.00                                                         
   1024x768      60.00                                                         
   800x600       60.32    56.25                                                
   640x480       59.94                                                         
DP1 disconnected (normal left inverted right x axis y axis)                    
DP2 disconnected (normal left inverted right x axis y axis)                    
HDMI1 disconnected (normal left inverted right x axis y axis)                  
HDMI2 disconnected (normal left inverted right x axis y axis)                  
VIRTUAL1 connected 2560x1600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm                                                                          
   2560x1600_60.00  59.99*                                                     
VIRTUAL2 connected 1920x1200+5120+0 (normal left inverted right x axis y axis) 0mm x 0mm                                                                       
   1920x1200_60.00  59.88*                                                     
VIRTUAL3 disconnected (normal left inverted right x axis y axis)

first, lets reset xrandr by setting the index back to zero:
xrandr -s 0

which will make xrandr look similar to this:

% xrandr                                                         
Screen 0: minimum 8 x 8, current 7040 x 1600, maximum 32767 x 32767            
eDP1 connected primary 2560x1600+2560+0 (normal left inverted right x axis y axis) 290mm x 180mm                                                               
   2560x1600     59.97*+                                                       
   2048x1536     60.00                                                         
   1920x1440     60.00                                                         
   1856x1392     60.01                                                         
   1792x1344     60.01                                                         
   1920x1200     60.00                                                         
   1600x1200     60.00                                                         
   1680x1050     60.00                                                         
   1400x1050     59.98                                                         
   1280x1024     60.02                                                         
   1400x900      60.00                                                         
   1280x960      60.00                                                         
   1280x800      60.00                                                         
   1024x768      60.00                                                         
   800x600       60.32    56.25                                                
   640x480       59.94                                                         
DP1 disconnected (normal left inverted right x axis y axis)                    
DP2 disconnected (normal left inverted right x axis y axis)                    
HDMI1 disconnected (normal left inverted right x axis y axis)                  
HDMI2 disconnected (normal left inverted right x axis y axis)                  
VIRTUAL1 connected 2560x1600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm                                                                          
   2560x1600_60.00  59.99*                                                     
VIRTUAL2 connected 1920x1200+5120+0 (normal left inverted right x axis y axis) 0mm x 0mm                                                                       
   1920x1200_60.00  59.88*                                                     
VIRTUAL3 disconnected (normal left inverted right x axis y axis)

now lets kill the running x11vnc sessions:
pkill x11vnc

lets turn off VIRTUAL1 && VIRTUAL2:
xrandr --output VIRTUAL1 --off
xrandr --output VIRTUAL1 --off

which will make your xrandr look similar to this:

% xrandr                                                                                                                                                                                                                                                                                                        
Screen 0: minimum 8 x 8, current 2560 x 1600, maximum 32767 x 32767                                                                                                                                                                                                                                                           
eDP1 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 290mm x 180mm                                                                                                                                                                                                                                 
   2560x1600     59.97*+                                                                                                                                                                                                                                                                                                      
   2048x1536     60.00                                                                                                                                                                                                                                                                                                        
   1920x1440     60.00                                                                                                                                                                                                                                                                                                        
   1856x1392     60.01                                                                                                                                                                                                                                                                                                        
   1792x1344     60.01                                                                                                                                                                                                                                                                                                        
   1920x1200     60.00                                                                                                                                                                                                                                                                                                        
   1600x1200     60.00                                                                                                                                                                                                                                                                                                        
   1680x1050     60.00                                                                                                                                                                                                                                                                                                        
   1400x1050     59.98                                                                                                                                                                                                                                                                                                        
   1280x1024     60.02                                                                                                                                                                                                                                                                                                        
   1400x900      60.00                                                                                                                                                                                                                                                                                                        
   1280x960      60.00                                                                                                                                                                                                                                                                                                        
   1280x800      60.00                                                                                                                                                                                                                                                                                                        
   1024x768      60.00                                                                                                                                                                                                                                                                                                        
   800x600       60.32    56.25                                                                                                                                                                                                                                                                                               
   640x480       59.94                                                                                                                                                                                                                                                                                                        
DP1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
DP2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                   
HDMI1 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
HDMI2 disconnected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
VIRTUAL1 connected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
   2560x1600_60.00  59.99                                                                                                                                                                                                                                                                                                     
VIRTUAL2 connected (normal left inverted right x axis y axis)                                                                                                                                                                                                                                                                 
   1920x1200_60.00  59.88                                                                                                                                                                                                                                                                                                     
VIRTUAL3 disconnected (normal left inverted right x axis y axis)

now lets delete the modes:
xrandr --delmode VIRTUAL1 "2560x1600_60.00"
xrandr --delmode VIRTUAL2 "1920x1200_60.00"

which will make xrandr to look similar to this:

% xrandr
Screen 0: minimum 8 x 8, current 2560 x 1600, maximum 32767 x 32767
eDP1 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 290mm x 180mm
   2560x1600     59.97*+
   2048x1536     60.00  
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   1920x1200     60.00  
   1600x1200     60.00  
   1680x1050     60.00  
   1400x1050     59.98  
   1280x1024     60.02  
   1400x900      60.00  
   1280x960      60.00  
   1280x800      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
VIRTUAL2 disconnected (normal left inverted right x axis y axis)
VIRTUAL3 disconnected (normal left inverted right x axis y axis)
  2560x1600_60.00 (0x16e) 348.500MHz -HSync +VSync
        h: width  2560 start 2760 end 3032 total 3504 skew    0 clock  99.46KHz
        v: height 1600 start 1603 end 1609 total 1658           clock  59.99Hz
  1920x1200_60.00 (0x16f) 193.250MHz -HSync +VSync
        h: width  1920 start 2056 end 2256 total 2592 skew    0 clock  74.56KHz
        v: height 1200 start 1203 end 1209 total 1245           clock  59.88Hz

now lets remove the two modes that we added:
xrandr --rmmode "2560x1600_60.00"
xrandr --rmmode "1920x1200_60.00"

which will clean up your xrandr:

% xrandr
Screen 0: minimum 8 x 8, current 2560 x 1600, maximum 32767 x 32767
eDP1 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 290mm x 180mm
   2560x1600     59.97*+
   2048x1536     60.00  
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   1920x1200     60.00  
   1600x1200     60.00  
   1680x1050     60.00  
   1400x1050     59.98  
   1280x1024     60.02  
   1400x900      60.00  
   1280x960      60.00  
   1280x800      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
VIRTUAL2 disconnected (normal left inverted right x axis y axis)
VIRTUAL3 disconnected (normal left inverted right x axis y axis)
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charlie root

VP of keeping it real / HNIC at pissedoffadmins.com
I bring the cold coffee.

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