Comment 1 for bug 778815

have the same problem, using open-source driver on Ubuntu 11.04. Had no issues with Ubuntu up to now and was running compiz with all it's bells n' whistles.

Unity 2d-mode works ok, but running glx-gears generates screen corruption within the terminal window ONLY.

also, problem seems to be intermittent, one day I had no screen glitches at all.

i suspect it's to do with accelerated graphics settings since it only occurs when glx enabled.