https://bugs.freedesktop.org/show_bug.cgi?id=45018
--- Comment #61 from Christian König deathsimple@vodafone.de 2012-06-06 02:15:10 PDT --- Please also try this patch: http://lists.freedesktop.org/archives/dri-devel/2012-June/023735.html
It doesn't fix anything rendering related, but instead fixes a deadlock introduced with the vm patch It isn't the complete solution of the problem it might still be an improvement.
Christian.