[Intel-gfx] vsync + vaapi question

Lukas Hejtmanek xhejtman at ics.muni.cz
Tue Dec 22 14:25:53 PST 2015

On Tue, Dec 22, 2015 at 08:54:08PM +0000, Chris Wilson wrote:
> Not really. The Primary output will be used as the vsync so long as a
> single pixel of the Window is upon it. Fundamentally, we need to use the
> output that the Window is on in order to driver the vblank update.

Which window? Any window or the va-api window? In the latter case, it would be
quite ok to setup left-of instead of clone and move mplayer window solely to
the external monitor. Do I understand it correctly?

> Ville once upon a time mentioned plans to try and synchronise the
> vblanks on matched outputs, i.e. start two 60Hz monitors at precisely
> the same time so they remain reasonably in sync.

hmm, well, right now, LVDS is running on 60Hz while HDMI2 runs at 30Hz.

Lukáš Hejtmánek

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