Comment 8 for bug 13839

I think I'm seeing the same bug in a different form. My screen resolution was
fine until about two weeks after an upgrade, at which point it dropped down to
1024x768. System->Preferences->Screen Resolution still has all my usual screen
resolutions listed, but switching to any of those higher than 1024x768 causes
the screen to wrap around itself. My /etc/X11/xorg.conf file seemed to have
been replaced with a new one during an upgrade. The new xorg.conf file didn't
carry over my previous screen resolutions, but the System->Preferences->Screen
Resolution application remembered them. I manually added screen resolution
settings to xorg.conf and rebooted. This seems to have fixed the problem.