https://bugs.freedesktop.org/show_bug.cgi?id=71864
--- Comment #15 from reimth@gmail.com --- (In reply to comment #10)
Is this still an issue with a newer kernel? Did you also update your userspace stack (mesa, xf86-video-ati)?
The bug seems to have nothing to do with the actual two X server configuration and the used window manager/desktop combination.
Last night we started an Ubuntu 12.04.3 Live CD session with kernel 3.8, whose 700 MB disk space just provide a simple standard one X server desktop (Unity, compiz, gdm). We experienced a few short (about half a second) black screens (GPU resets?) and after about 10 min. a kernel freeze with striped screen.
Unfortunately, the Ubuntu Live CD does not come with a netconsole, so we have no logs.