https://bugs.freedesktop.org/show_bug.cgi?id=81644
--- Comment #93 from Maciej gutigen@outlook.com --- (In reply to comment #91)
I'm sorry to hear that. We're working on it, but since we haven't been able to reproduce these issues, we need your help for testing: Does the environment variable R600_DEBUG=nodma help? If not, can you try if Mesa 10.1 is stable for you, and if so, bisect between 10.1 and 10.2?
R600_DEBUG=nodma doesn't seem to help, got a hang while typing this comment.
It doesn't happen with Mesa 10.1 from default Ubuntu 14.04 installation, but I need at least Mesa 10.3 and llvm-3.5 for any enjoyable gaming. My choice is either use Mesa for gaming, but then I can't use browser with any sort of hardware acceleration (or flash) or use fglrx for awesome 12fps desktop performance (cause fglrx is broken at all fronts).
As for bisecting, I have no idea how to do that, nor I have time to learn - I'm just a Ubuntu user with no technical skills.