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Better late than never? Interestingly only available from the BLT ring, which makes accurate waiting for XVideo (which must use the render ring) impossible in the current form - we need to render to a temporary then do a vsynced blit in this case. References: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1156679 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>