[Nouveau] [Bug 103202] Tearing with reverse prime (intel primary, nouveau secondary)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103202

--- Comment #4 from Michel Dänzer <michel at daenzer.net> ---
(In reply to post+fdo from comment #3)
> It seems there is some work on getting synchronization to work with PRIME
> <https://www.x.org/wiki/Events/XDC2016/Program/xdc-2016-prime-sync.pdf>; [...]

FWIW, it's possible to avoid tearing between GPUs in a much less complicated
way than that, if the drivers for both GPUs use the ScreenRec::SyncSharedPixmap
hook. You can take a look at xf86-video-amdgpu/ati for an example. (The driver
of the displaying GPU also needs to separately prevent tearing of the scanout
process itself. xf86-video-amdgpu/ati do this by default for PRIME outputs)

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