[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 #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
Whoever claims it first. At the moment the rule is user desired crtc, primary
output->crtc, greatest covering, anything.

Flips between monitors are not coordinated - from the plls up. That drift will
only be worse with multiple drivers trying to coordinate the flip. The current
solution is that one crtc is chosen as the magic timing source and we hope the
others are close enough that no one complains.

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