https://bugs.freedesktop.org/show_bug.cgi?id=87023
--- Comment #11 from Alex Deucher alexdeucher@gmail.com --- (In reply to Romy from comment #10)
What do you mean bisect mesa? Did you mean I must installing mesa 10.1.3 and send you xorg log and dmesg output?
bisecting is a git feature you can use to identify what commit causes a regression. You just checkout the mesa git tree and mark what commits were working and not-working and it will walk you hrough the rest to identify the culprit. Google for git bisect howto.