Bug 94011

Summary:	rendering corruption (horizontal banding) when not on battery power
Product:	DRI	Reporter:	Giuseppe Bilotta <giuseppe.bilotta>
Component:	DRM/Intel	Assignee:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Status:	CLOSED FIXED	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	normal
Priority:	medium	CC:	intel-gfx-bugs
Version:	XOrg git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:	HSW	i915 features:

Description Giuseppe Bilotta 2016-02-05 18:09:35 UTC

Running on Debian unstable, with the upgrade to xserver-xorg 2:1.18.0-3 and
xserver-xorg-video-intel 2:2.99.917+git20160127-1+b1 I'm experiencing
the weirdest rendering corruption, which mostly manifests through a
horizontal banding of the display. Snapshots of the correct and glitched
display can be found at these imgur links:

http://i.imgur.com/V9V8s8h.png
http://i.imgur.com/NhNq9OF.png

The issue doesn't normally manifest in my setup and with the applications
I use, with the only exception of Opera 12, which manifests it quite
consistently. Previous versions of the graphics stack on Debian (particularly
xserver-xorg-video-intel 2:2.99.917-2 from testing, on pre-1.18
Xorg) work fine.

Most interesting, the glitch only manifests when running on AC. If the
laptop is on battery, there are no issues.

(Reported as Debian bug #813625: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=813625, which include Xorg and dmesg snippet. Shall I attach them to this report as well? Hardware is the IGP of an Intel(R) Core(TM) i7-4712HQ CPU @ 2.30GHz)

Comment 1 Giuseppe Bilotta 2016-02-08 19:29:47 UTC

Additional information: switching to AccelMethod UXA instead of SNA fixes the problem for me, so it would seem the issue is in the SNA code.

Comment 2 Jari Tahvanainen 2017-02-07 17:08:53 UTC

sorry about not taking this up earlier. Please can you test this with latest kernel and xorg-video-intel. There has been many fixes introduced which might resolve your problem.

Comment 3 Ricardo 2017-03-03 17:22:51 UTC

Giuseppe have you been able to retest with updated kernel and xorg-video-intel?  we are sorry we did not responded for a while to your bug. Jari suggested this a month ago, please collaborate with us to help you

Comment 4 Giuseppe Bilotta 2017-03-03 18:58:36 UTC

Hello, with kernel 4.9 and xserver-xorg-video-intel  2:2.99.917+git20161206-1 and libdrm-intel1 2.4.74-1 the issue seems to be gone. I'm marking the issue RESOLVED FIXED. Thanks for pinging me, for some reason I had missed the previous comment.

Comment 5 yann 2017-03-08 17:31:01 UTC

(In reply to Giuseppe Bilotta from comment #4)
> Hello, with kernel 4.9 and xserver-xorg-video-intel 
> 2:2.99.917+git20161206-1 and libdrm-intel1 2.4.74-1 the issue seems to be
> gone. I'm marking the issue RESOLVED FIXED. Thanks for pinging me, for some
> reason I had missed the previous comment.

thanks Giuseppe

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