(In reply to comment #2)
> Note: classic r600 driver has been abandoned.
> Please use r600g (gallium driver) instead.
> 
> Is this still an issue with a newer driver/kernel?

Have not been able to reproduce the bug with current setup:

Radeon HD6950
Blender 2.64a-5
xf86-video-ati 1:6.14.6-2
ati-dri 9.0-1