https://bugs.freedesktop.org/show_bug.cgi?id=56139
--- Comment #48 from Alexandre Demers alexandre.f.demers@gmail.com --- (In reply to comment #47)
A patch referencing this bug report has been merged in Linux v3.8-rc7:
commit ed39fadd6df01095378e499fac3674883f16b853 Author: Alex Deucher alexander.deucher@amd.com Date: Thu Jan 31 09:00:52 2013 -0500
drm/radeon/evergreen+: wait for the MC to settle after MC blackout
Still not fixed with 3.8.0