Comment # 9 on bug 60802 from Jakob Nixdorf

I got similar looking corruptions in Counter Strike: Source and Trine 2 (via
Steam) since my update from kernel 3.7.9 to 3.8.0 this morning (Arch Linux
x86_64, newest mesa from git).

When I get back from the university I will check if I can confirm your commit
as the culprit.