In my xorg.conf under
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
HorizSync 30-96
VertRefresh 50-160
EndSection
and
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1024x768"
EndSubSection
EndSection
I added the HorizSync and VertRefresh and to Modes I added 1280x1024 and
it now seems to recognize the full range of screen resolutions options.
However if I set it above 1024x768 I lose the mouse cursor. I can use
the mouse, if it goes over any buttons there is a slight change in
colouring or become slightly brighter so I can click on or use the
spacebar on the button and it will work, but no actual cursor so I can
see where it is.