https://bugs.freedesktop.org/show_bug.cgi?id=94484
--- Comment #6 from Michel Dänzer michel@daenzer.net --- (In reply to Tyler Brock from comment #5)
Anything I can do to help? Bisecting would be hard as its not reproducible 100% of the time. It would essentially take a day to test each revision.
That's fine; take your time. (If you had started when you reported the bug, you might be done by now :)