Comment # 29 on bug 71448 from Vladimir Ysikov

(In reply to comment #28)
> Created attachment 93072 [details]
> Fix.
> 
> Sorry that it took me so long to find this. It's a rather simple issue that
> the IRQ support for UVD on SI wasn't activated.
> 
> With this patch in place I now get 52fps with 1080p H264 decoding.

With this patch I get gpu lockup and Xorg crash. kernel 3.13.1, mesa-git,
llvm-svn, Archlinux x86.