[Bug 99128] External monitor ("reverse PRIME", Output Sink) updates very slowly (1fps) when laptop screen is off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99128

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Peter Wu from comment #0)
> Other information:
> A similar problem existed in the modesetting driver, fixed in Xorg 1.19 with
> https://lists.x.org/archives/xorg-devel/2016-August/050797.html
> I think that a similar fix can be developed for sna_display.c
> (sna_covering_crtc).

That is what sna_covering_crtc has been doing that for the last few years. The
problem is that you don't have any Intel CRTCs from which we can use as a
vblank source and so you suffer from the woeful present fallback, as we don't
seem to be able to offload the vblanks onto the slave outputs.

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