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View Full Version : [ubuntu] Screen Resolution problems



DanielJackins
September 16th, 2009, 12:04 AM
I recently installed Ubuntu 9.04 and have been unable to get screen resolutions working. The screen is a TV rather than a monitor, if that changes anything.

Here's the output of xrandr:

Screen 0: minimum 640 x 480, current 800 x 600, maximum 800 x 600
default connected 800x600+0+0 0mm x 0mm
800x600 61.0*
640x480 60.0

Any help would be great, thanks.

CatKiller
September 16th, 2009, 04:56 AM
Normally, resolution problems are caused by one of the monitor, the graphics card, or the graphics driver not passing the EDID information to X that lets it automatically set the correct refresh rate, and so it defaults to really low values that won't damage any monitors. You can manually set the values for your monitor by putting the VertRefresh and HorizSync ranges in your xorg.conf. You should be able to get these numbers from the manual or specifications for your monitor. These values go in the "Monitor" Section of xorg.conf.

You can edit xorg.conf with
sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
gksudo gedit /etc/X11/xorg.conf
Section "Monitor"
Identifier "Configured Monitor"
HorizSync aa-bb
VertRefresh cc-dd
EndSection
You'll need to replace aa-dd with the values for your monitor.