https://bugs.freedesktop.org/show_bug.cgi?id=50655
--- Comment #14 from Marek Olšák maraeo@gmail.com 2012-06-07 09:19:52 PDT --- (In reply to comment #11)
Marek, any ideas? (bug 47116 might be related)
Sorry I've got none. All the regs were really invariant at the time I wrote the commit. A hardware bug like Alex suggested is one possible explanation...