I actually think this is a regression in mesa, which I upgraded from 7.6.0~git20090603.1ad15768-0ubuntu0sarvatt to 7.6.0~git20090603.1ad15768-0ubuntu0sarvatt (xorg-edgers PPA).
I actually think this is a regression in mesa, which I upgraded from 7.6.0~git200906 03.1ad15768- 0ubuntu0sarvatt to 7.6.0~git200906 03.1ad15768- 0ubuntu0sarvatt (xorg-edgers PPA).