https://bugs.freedesktop.org/show_bug.cgi?id=110897
--- Comment #71 from Richard Thier u9vata@gmail.com --- Made a similar writeup on this topic too:
http://ballmerpeak.web.elte.hu/devblog/debugging-hyperz-and-fixing-a-radeon-...
Also tried to document all relevant information if it ever helps anyone.