Comment # 7 on bug 91527 from JATothrim

(In reply to Christian König from comment #6)
> Well have you tested this with the current upstream kernel? E.g. 4.1 or a
> recent rc of 4.2?
> 
> That's usually the first thing you should to to figure out if newer kernels
> are already fixed.

Phew. I finally managed to compile/test newer kernel v4.2 and this bug is
fixed! :) Yay!
My tip for radeon 7870 owners: if your screen freezes and turns into a weird
rainbow mess try kernel v4.2.