[Intel-gfx] vsync + vaapi question

Lukas Hejtmanek xhejtman at ics.muni.cz
Wed Dec 23 04:13:46 PST 2015

On Wed, Dec 23, 2015 at 12:01:44PM +0000, Chris Wilson wrote:
> The clipped extents of the va-api Window is used to determine which CRTC
> to use as the vblank source. Hmm, the Primary Output is used as the
> preference (i.e. if any part of that Window is on the Primary, it is
> used as the CRTC - the idea being that Primary is important and this
> should share the vblank source for more Windows and prevent arbitrary
> jumps between vblank sources as the Window moves).

just tested, with xv output, vsync seems to be quite ok. however, with va-api
it not ok on both LVDS and HDMI. HDMI seems to be far worse with va-api (i.e.
out of sync). Maybe a bug in va-api sync code?

Lukáš Hejtmánek

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