Comment # 8 on bug 74784 from Andreas Boll

(In reply to comment #7)
> With mesa at commit 6d1cecb (Friday evening) this problem is fixed.
> 
> Thanks!
> 
> P.D: Maybe it was related to the hyperz problem of r600g drivers, as I am
> using a revision that is after this commit
> http://cgit.freedesktop.org/mesa/mesa/commit/
> ?id=01e637114914453451becc0dc8afe60faff48d84

Could you set the following environment variable to re-enable hyperz?

R600_DEBUG=hyperz