Comment # 25 on bug 63997 from Mirko

(In reply to comment #24)
> It was against my drm-fixes tree, but it should apply pretty easily to most
> kernels.

Unfortunately the problem seems to be the same. 
Patched linux kernel 3.11.1
Xorg server 1.14
Mesa 9.2.0
Radeon 7.2.0

Tell me if I have to do other tests. At your disposal.

Thanks for help.