Fix Unknown Display in ubunty


In my case I needed the 1360x768 resolution (it only gave me the option for chosing 1024x768 or 800x600)
 so here is how I got the right resolution:
alex@Minx:~$ xrandr
Screen 0: minimum 8 x 8, current 1024 x 768, maximum 32767 x 32767
HDMI1 disconnected (normal left inverted right x axis y axis)
VGA1 connected primary 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768      60.00* 
   800x600       60.32    56.25  
   848x480       60.00  
   640x480       59.94  
VGA1 is my device, then I created the resolution I wanted
alex@Minx:~$ sudo cvt 1360 768 60
# 1360x768 59.80 Hz (CVT) hsync: 47.72 kHz; pclk: 84.75 MHz
Modeline "1360x768_60.00"   84.75  1360 1432 1568 1776  768 771 781 798 -hsync +vsync
Created a new mode for my resolution:
alex@Minx:~$ xrandr --newmode "1360x768_60.00"   84.75  1360 1432 1568 1776  768 771 781 798 -hsync +vsync
Finally added the new mode to my VGA1 device:
alex@Minx:~$ sudo xrandr --addmode VGA1 1360x768_60.00
Then I went to Displays and was able to select the 1360x768 resolution.


source: here

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