[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 #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
Both DRI2 and DRI3 do prime by copying onto the slaves (though DRI3 should be
quite capable of passing over scanout buffers fitting to the slave CRTC). This
requires additional steps in the slave ddx to avoid the tear. -intel/radeon
both offer the option to stage that copy into a back buffer for flipping to
avoid the tear; but yes, X tears by default.

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