[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 #8 from Grigori Goronzy <greg at chown.ath.cx> ---
The vsynced blit path for presentation is implemented by *stalling* GPU command
processing. That's a big hammer, and might be related to your problems. You can
skip this (at the cost of tearing in some cases) by disabling SwapBuffersWait.
Have you tried that, just for testing?

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