I believe this is what causes your problem. I've seen a few of these with 
different drivers (also chrome, vesa, radeon, etc.) with Xserver 1.6.x:
(WW) NV(0): Unable to estimate virtual size
...
(--) NV(0): Virtual size is 800x600 (pitch 800)

All modes greater than the virtual screen size are rejected. To work around, 
manually specify the virtual size by adding something like this to the Screen 
Section in xorg.conf:
SubSection "Display"
        Depth  24
        Virtual 1280 1024
EndSubSection

-- 
Fewer display resolutions after upgrading to Jaunty with GeForce4
https://bugs.launchpad.net/bugs/378532
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