[Bug 72290] [945GM] video tearing in mpv (xf86-video-intel-2.99.906)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72290

--- Comment #13 from Chris Wilson <chris at chris-wilson.co.uk> ---
TearFree is a driver option to redirect rendering onto a backbuffer and
pageflip, like a compositing manager.

VSync is the mechanism the driver uses to prevent the GPU from rendering onto
the frontbuffer whilst the display is scanning out from the target area - it
prevents tearing within a window. For a fullscreen swapbuffer, we would use a
pageflip instead. Hmm, actually if the application is too slow and misses its
requested frame, the driver applies "Adapative VSync" and blits the update onto
the scanout unsynchronised to the vertical refresh (in order to allow the
application to catch up with its timeline).

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