Comment 13 for bug 1395182
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#13 |
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7020100
(Get the code!)
(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 975b9798be77b30
Author: Chris Wilson <email address hidden>
Date: Wed May 21 08:58:24 2014 +0100
sna: Add support for Present
The problem goes away after commit
commit 105d478cdd70ac3
Author: Chris Wilson <email address hidden>
Date: Wed Aug 6 09:10:30 2014 +0100
sna: Enable kernel rotation support by default
but oddly, after
commit b6eeb7a1f7efa59
Author: Chris Wilson <email address hidden>
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.