(In reply to smoki from comment #0)
>  Attached is screenshot from Unigine Valley for example, there are major
> rendering issues in many other GL apps.

Haven't seen such artifacts on Kaveri. Can you attach the stderr output of
running Valley or another affected app with R600_DEBUG=vs,ps with and without
the bisected commit?

>  For Firefox crashing xserver not sure how to debug that [...]

Is there something about it in the Xorg stderr output? It should be captured in
a gdm log file.