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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - extra vsync when reading back pixels in xbmc"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79223#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - extra vsync when reading back pixels in xbmc"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79223">bug 79223</a>
from <span class="vcard"><a class="email" href="mailto:pierre-bugzilla@ossman.eu" title="Pierre Ossman <pierre-bugzilla@ossman.eu>"> <span class="fn">Pierre Ossman</span></a>
</span></b>
<pre>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.</pre>
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