Code:
sudo nano /etc/X11/xorg.conf
Scroll down to near the bottom to Section "Screen", and in each of the Subsction "Display" area the "Modes" lines you should have your desired resolution as the first option beneath your desired colour depth, like this:
Code:
Section "Screen"
Identifier "screen1"
Device "device1"
Monitor "monitor1"
DefaultColorDepth 24
Subsection "Display"
Depth 24
Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480"
EndSubsection If that is not the case, you will need to find the horizontal and vertical refresh rates of your monitor and specify them in the Monitor section above, example:
Code:
Section "Monitor"
Identifier "monitor1"
VendorName "Generic"
ModelName "1280x1024 @ 60 Hz"
HorizSync 31.5-64.3
VertRefresh 50-70
EndSection