Try change the depth, sometimes it is too high and the adapter can't handle it, lower depth may allow higher resolutions in some cases.
You can also use xrandr to adjust the resolution, yet another way is to edit the xorg.conf, and you may find different approaches to fix it.
Regards
Last edited by ukiuki; 01-27-2013 at 05:35 PM.
Reason: typo
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