Useful trick for changing resolutions
I was helping a May First/People Link member with a projector presentation (my personal laptop, liberace, was drafted into service) yesterday when I realized that liberace’s screen resolution was too wide for the projector to handle.
I’m familiar with the solution on a desktop computer (that has the numbers keypad): Ctrl-Alt-Keypad+ and Keypad- to dynamically change your resolution. However, liberace, like most laptops, doesn’t have a keypad. After futzing with the projector, I finally got it to display the screen properly, however, I really could of used a method for changing the resolution.
After a little bit of research I discovered the xrandr command. When run with no arguments, it displays your available resolutions:
0 jamie@liberace:~$ xrandr Screen 0: minimum 320 x 200, current 1280 x 800, maximum 1280 x 1280 VGA disconnected (normal left inverted right x axis y axis) LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis) 261mm x 163mm 1280x800 65.3 + 60.0* 1280x768 60.0 1024x768 60.0 800x600 60.3 640x480 59.9 TMDS disconnected (normal left inverted right x axis y axis) 0 jamie@liberace:~$
You can switch resolutions with:
0 jamie@liberace:~$ xrandr -s 800x600 -r 60 0 jamie@liberace:~$
You don’t even need to be root!