[Bug 86548] [3.18 regression] Screen tears on xrandr orientation inverted

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86548

--- Comment #9 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
(In reply to Chris Wilson from comment #8)
> Yikes, this regression made it into a stable release.

I was actually able to reproduce this with 3.14. I tried to reproduce this
before with drm-intel-nightly on SNB, IVB and HSW, but failed. Turns out I
needed a more recent xorg intel driver to uncover the bug. I bisected the first
appearance of the bug to

commit 975b9798be77b30cbed485583d0ccb48318708f7
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed May 21 08:58:24 2014 +0100

    sna: Add support for Present


The problem goes away after commit

commit 105d478cdd70ac3b38be51c9014b22b7233c241e
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Aug 6 09:10:30 2014 +0100

    sna: Enable kernel rotation support by default


but oddly, after 

commit b6eeb7a1f7efa591504070b606be655e27e6e9c2
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Nov 5 13:03:41 2014 +0000

    Disable DRI3 by default

turning the rotation on with xrandr causes a black screen that can be fixed by
vt switching away and back to X.

Anyway, I haven't looked yet into why the support for the Present extension
uncovers the bug, but it seems this bug has been in the kernel for a while.

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