FROM: http://itknowledgeexchange.techtarget.com/itanswers/change-screen-resolution-to-1024768/


The "screen" section in xorg.conf looks like this,
and "device" and "monitor" lines should refer to real
"device" and "monitor" sections in the file…

####################
Section "Screen"
Identifier "LCD"
Device "nv6200"
Monitor "vg712s"
DefaultDepth 24

SubSection "Display"
Viewport 0 0
Virtual 1280 960
Depth 16
Modes "1280×960" "1024×768" "800×600"
EndSubSection

SubSection "Display"
Viewport 0 0
Virtual 1280 960
Depth 24
Modes "1280×960" "1024×768" "800×600"
EndSubSection
EndSection
###########