https://bugs.freedesktop.org/show_bug.cgi?id=54129
--- Comment #4 from Andrea mariofutire@googlemail.com 2012-08-28 20:26:30 UTC --- (In reply to comment #3)
Also can you test if booting with radeon.no_wb=1 fix the issue ?
this did not make any difference (tested on v3.6-rc3 where the problems still exists)