(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 <ch...@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 <ch...@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 <ch...@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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https://bugs.launchpad.net/bugs/1395182
Title:
Screen tears on xrandr orientation inverted
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