https://bugs.freedesktop.org/show_bug.cgi?id=92944
--- Comment #2 from Michel Dänzer michel@daenzer.net --- Might be a duplicate of bug 92709.
If http://lists.freedesktop.org/archives/mesa-dev/2015-November/100742.html doesn't help, please run the game with the environment variable R600_DEBUG=vs,gs,ps and attach its stderr output.