[Bug 81383] [intel+nvidia randr offloading] X segfaults with latest intel drivers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81383

--- Comment #14 from Tomas Pruzina <pruzinat at gmail.com> ---
(In reply to comment #13)
> The fix in your case should be fairly trivial, remove the
> sna_crtc->transform = true and remember to unoffset the CRTC. However,
> handling the transformed slaved CRTC was broken.
> 
> 
> commit a45b2ea11c15f35c36330ff27cb45854a29c2e2c
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Thu Jul 17 14:40:51 2014 +0100
> 
>     sna: Handle rotated slaved scanouts
>     
>     As per the usual handling of rotated scanouts with unsupported
>     rotations, we stage the drawing onto a backbuffer then rotate onto the
>     crtc later. The difference here is that we must read the contents from
>     the master pixmap rather than our own screen pixmap.
>     
>     Spotted was looking at slaved scanouts mistakenly setting the CRTC
>     transformed flag.
>     
>     Reported-by: Tomas Pruzina <pruzinat at gmail.com>
>     Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81383
>     Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Thanks, I'll test it for a bit and report back if anything is unstable.

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