https://bugs.freedesktop.org/show_bug.cgi?id=94414
--- Comment #13 from Michel Dänzer michel@daenzer.net --- (In reply to Jean-Philippe Gariépy from comment #11)
The only hint that I have so far is the "r300: CS space validation failed." message. If it's a problem with the desktop compositor violating the contract, which Gnome component is reponsible? Just trying to log the bug at the right level.
It's probably assigned correctly now. The message indicates that the r300 driver isn't coping with the amount of VRAM available to it.