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It is not uncommon to have to do a little work to get the resolution you want.
What is your video card? Did you install special drivers for it? Copy and post your xorg.conf sections for Monitor, Modes (if present), Device, and Screen. What is your monitor, and do you know the specs for horizontal sync and vertical refresh? What resolution do you want? If you have an LCD monitor, what is its native resolution?
Back up your xorg.conf, so you can edit it. Make sure the specs in the monitor section are right for your monitor. If you installed a special driver, is it called out in the Driver line under Device? If all that is OK, you may just need to add the resolution you want to the Screen section. Here is an example screen section:
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor1"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1600x1200" "1400x1050" "1280x1024"
EndSubSection
EndSection
The default mode for my system is "1600x1200". Let's say you have an LCD with 1280x1024 native resolution, then your modes line could be as simple as 'Modes "1280x1024"', but you should keep a mode that you know works there too.
These are some ideas to get you started, but don't get disappointed if you have some more work to do to get it working the way you want it.
Rob
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