[Bug 110245] Severe tearing and display corrupting when using SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110245

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
It's just whether the corruption is apparent int the screenshots and if that
corruption only occurs on the external outputs that is particularly of
interest. If you don't see it in a screenshot (and that screenshot shows the
remote output windows correctly) that implies the corruption is entering in ivo
-> bumblebee path.

We should be pageflipping on the internal screen, no matter what. That may
still tear across between client rendering (if the client split his update into
two requests and we perform a page flip in between), or it may tear in
situations where we give the client direct access to the screen and require
them to manage it through glXSwapBuffers (that should only impact DRI3 iirc).

ivo doesn't try to avoid tearing on the external screens at all atm. It's a
wishlist item along with using DRI3 to avoid the copies; at which point,
xrandrproviders were meant to be the better solution. Nothing should have
changed to make it any worse, though.

Anyway, the immediate problems are tearing on the internal and corruption on
the external?

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