[Bug 5876] big xvideo issues with ATI Radeon RV100 family (Mobility M6 LY, ...)

bugzilla-daemon at annarchy.freedesktop.org bugzilla-daemon at annarchy.freedesktop.org
Mon Dec 4 03:14:04 PST 2006

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michel at tungstengraphics.com changed:

           What    |Removed                     |Added
         AssignedTo|agd5f at yahoo.com             |xorg-driver-ati at lists.x.org
         OS/Version|OpenBSD                     |All
            Summary|big xvideo issues with ATI  |big xvideo issues with ATI
                   |Radeon Mobility M6 LY       |Radeon RV100 family
                   |                            |(Mobility M6 LY, ...)
            Version|6.9.0                       |git

------- Additional Comments From michel at tungstengraphics.com  2006-12-04 03:14 -------
(In reply to comment #16)
> I don't know how double buffering on the radeon works, but I assume that the hw
> has two buffers (A and B), and switches between them on vsync blank. But what
> makes sure that if A is displayed and we're writing into B, that the switch
> doesn't occur until we've written an entire frame to B?

The driver only initiates the flip after the upload of the new frame is complete
(with DMAForXv/DRI disabled, anyway...). One thing it doesn't do yet though is
wait for the previous flip to complete before uploading a new frame, which could
result in the upload overwriting the frame that's being displayed. Patch #7940
from bug 8938 was an attempt at fixing that, does it make any difference (for
better or worse) now?          
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