https://bugs.freedesktop.org/show_bug.cgi?id=71448
--- Comment #29 from Vladimir Ysikov grantipak@gmail.com --- (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.