[Bug 79223] extra vsync when reading back pixels in xbmc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79223

--- Comment #7 from Pierre Ossman <pierre-bugzilla at ossman.eu> ---
Anyhoo, getting back to the matter at hand.

I set up a new machine so I can more easily do debugging of this. The hardware
is instead:

00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Richland [Radeon HD 8510G]

Not identical, but should be a very similar chip (ARUBA vs TURKS).


I am still seeing the frame rate problem on this machine. It is however not
constant, and comes and goes. I am running a lower resolution here, which might
be a factor.

Also, for some reason I am not getting delays in glReadPixels(). So whatever
goes wrong must be happening some place else.



I turned on some of the gallium overlays. Not sure if this tells you anything:

 - Normal playback: buffer wait time of 15k-20k

 - With glReadPixels(): ~35k

 - When the bug strikes: jumps to ~50k

The frame rate frop and buffer wait time increases are perfectly synchronised
every time.

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