I can third this problem - I get much screen garbage when running twinview on my nvidia 5200fx card. It can't run at native resolution (being 1600*1200), but if I downgrade the resolution to 1200*1024, it's fine albeit the aspect ratio seems off. Just thought I'd put in my two cents. FYI, until I upgraded from edgy yesterday, no problems.
-- In Feisty Fawn, nvidia-glx 1.0.9xxx causes graphical glitches, artifacts and random system crashes https://launchpad.net/bugs/85449 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs