https://bugs.freedesktop.org/show_bug.cgi?id=72921
--- Comment #18 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #17)
(In reply to comment #16)
Created attachment 101179 [details] [review] [review] possible fix
Maybe there is some problem with the clocks or voltage in the highest power level. Does the attached patch help?
Where and how do I apply this patch to... wherever it's supposed to go? And will it work on a Richland APU?
It applies to the kernel. You need to apply the patch and build and install the kernel.