I've done another beta release of the X.org ATI driver.
This contains some fixes for a segfault in the DPMS paths on certain cards, RS480 support for 3Ds (requires newer Mesa), better VBL support for lowering power consumption if the kernel drm supports it, along with a bunch of bugfixes and cleanups.
There is a blocker bug 11749 for the 6.7 release.