https://bugs.freedesktop.org/show_bug.cgi?id=44772
--- Comment #8 from Harald Judt h.judt@gmx.at 2012-06-14 15:02:10 PDT --- Still reproducible with 3.4.0 final and "drm/radeon: fix vm deadlocks on cayman" applied, but at least I do not experience freezes anymore.