https://bugs.freedesktop.org/show_bug.cgi?id=32296
--- Comment #3 from Chris Rankin rankincj@googlemail.com 2011-01-08 15:02:19 PST --- HyperZ is now working with my M66GL (0x71D4); I'm not sure why.
The RV350 (0x4153) is still broken, but the corruption disappears if I comment out the "Fast Z clear" code in r300_clear() (r300_blit.c, lines 184-195).
Given that the RV350 doesn't support Hierarchical-Z in the first place, I'm not sure how much of HyperZ is actually left without Fast Z clears, but anyway... ;-).