https://bugs.freedesktop.org/show_bug.cgi?id=71239
--- Comment #22 from Krzysztof A. Sobiecki sobkas@gmail.com --- (In reply to comment #20)
I can confirm fixed rendering on r600g with this: https://bugs.freedesktop.org/show_bug.cgi?id=71870#c25
It fixed the problem, will make a patch for it.