https://bugs.freedesktop.org/show_bug.cgi?id=35935
--- Comment #3 from Alex Deucher agd5f@yahoo.com 2011-04-03 16:59:38 PDT --- (In reply to comment #0)
Since I'm using kernel 2.6.38.1, Xorg screen became garbled after some times (see screenshot). It occurs on 2.6.38.2 but seems to be less frequent (3-4 hours for 2.6.38.1 ; 8-10 for 2.6.38.2) I didn't get this bug with 2.6.38
Did you update anything besides the kernel between 2.6.38 and 2.6.38.1 (mesa of xf86-video-ati)? If the same userspace components (mesa, xf86-video-ati) work on 2.6.38 and become garbled on 2.6.38.1, can you bisect between 2.6.38 and 2.6.38.1 and see which commit caused the problem? If you updated the userspace components as well, this is probably a duplicate of bug 33929.