https://bugs.freedesktop.org/show_bug.cgi?id=64320
--- Comment #3 from Marc Dietrich marvin24@gmx.de --- I don't see Kwin corruptions as reported in bug 64257. Also this bug says nothing about GPU lockups. But what I also see is a "dark glxgears" effect.
It's kinda hard to bisect this because r600 now depends on llvm and different mesa versions may require different llvm versions. I can try using the llvm version as written in LLVM_REVISION.TXT, but that may take some time.