[Intel-gfx] vsync + vaapi question

Chris Wilson chris at chris-wilson.co.uk
Tue Dec 22 12:54:08 PST 2015

On Fri, Dec 18, 2015 at 07:08:11PM +0100, Lukas Hejtmanek wrote:
> Hello,
> is it possible to switch vsync from internal LCD (laptop) to external monitor
> when playing movie via VA-API? I can drop vsync with internal LCD and keep
> vsync only with external monitor. I tried to use --primary for excernal
> monitor when enabling output but no luck. 

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.
> Is there any way to sync with external monitor? Chris once told me that
> anything is possible. So? :)

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.

Chris Wilson, Intel Open Source Technology Centre

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