[Bug 94011] New: rendering corruption (horizontal banding) when not on battery power

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94011

            Bug ID: 94011
           Summary: rendering corruption (horizontal banding) when not on
                    battery power
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: giuseppe.bilotta at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

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)

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