Xrandr, or X Resize, Rotate and Reflect Extension (RandR)[2] is an X Window System extension, which allows clients to dynamically change X screens, so as to resize, rotate and reflect the root window of a screen.
Follow these steps:
- On your Ubuntu machine, run xrandr:
$ xrandr
~$ xrandr SZ: Pixels Physical Refresh 0 1024 x 768 ( 347mm x 260mm ) 60
1 160 x 120 ( 54mm x 41mm ) 60
2 320 x 240 ( 108mm x 81mm ) 60
3 640 x 480 ( 217mm x 163mm ) 60
4 800 x 600 ( 271mm x 203mm ) 60
Current rotation - normal
Current reflection - none
Rotations possible - normal
Reflections possible - none
This gives you a list of all the available resolutions supported by your Ubuntu computer. - If you want to add a new resolution, say 1680 X 1050, add it:
$ $ cvt 1680 1050
This outputs:
~$ cvt 1680 1050
1680x1050 59.95 Hz (CVT 1.76MA) hsync: 65.29 kHz; pclk: 146.25 MHz
Modeline "1680x1050_60.00" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync - Now you need to create a modeline
$ xrandr --newmode <Modeline>
Replace <Modeline> with the modeline of the previous output:
$ xrandr --newmode "1680x1050_60.00" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync - That's it. Now when you run xrandr again, you would see that the newly added resolution in the list:
~$ xrandr SZ: Pixels Physical Refresh 0 1024 x 768 ( 347mm x 260mm ) 60
1 160 x 120 ( 54mm x 41mm ) 60
2 320 x 240 ( 108mm x 81mm ) 60
3 640 x 480 ( 217mm x 163mm ) 60
4 800 x 600 ( 271mm x 203mm ) 60
5 1680 x 1050 ( 569mm x 356mm ) 60
Current rotation - normal
Current reflection - none
Rotations possible - normal
Reflections possible - none - Establish a new NX connection to your Ubuntu--use the KDE/Gnome and it picks up the highest available resolution from that list supported by your client.
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