https://bugs.freedesktop.org/show_bug.cgi?id=34336
--- Comment #5 from Marek Olšák maraeo@gmail.com 2011-02-19 01:41:00 PST --- Please try the latest Mesa master branch. Alternatively, you may try and set either of these environment variables and see if it helps:
RADEON_THREAD=0 RADEON_DEBUG=noimmd