I can confirm that http://cgit.freedesktop.org/mesa/mesa/commit/?id=6532eb17baff6e61b427f29e076883f8941ae664 is the first Mesa commit where the lockups occur. With http://cgit.freedesktop.org/mesa/mesa/commit/?id=24b1206ab2dcd506aaac3ef656aebc8bc20cd27a it still works on kernel 3.8.0-rc4 Is there anything else I can do to help fixing this bug?