Radeon Driver Gets Tear-Free X-Video
While there still is no open-source R600/700 3D documentation or code, Pierre Ossman and AMD's Alex Deucher working on the xf86-video-ati driver have added a feature that should please those with already supported GPUs. They have added what should be tear-free X-Video support!
For those using EXA acceleration with this open-source ATI driver, this feature can be enabled through the EXAVSync option in your xorg.conf. At the same time, Bi-cubic X-Video filtering for the R300/400 series has also been fixed.
Right now if you want this support you'll need to check out the latest Git master code for xf86-video-ati until a new release is made available. Additional details are available from Alex's blog. Further commentary can be found on David Airlie's blog.