Comment # 9 on bug 68799 from Stanisław Halik

Last I know Hyper-Z was disabled due to few cases like this, and can be
re-enabled through the `SB_DEBUG' environment variable. It would be interesting
to see if r600 gallium-nine also exercises the freeze. The original freeze
happened using Wine's d3d9 -> opengl translation.

Sadly I cannot make a new trace as that 6970 gave up the ghost.