[Bug 63383] New: [i915 vga output] glitchy output when attaching external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63383

          Priority: medium
            Bug ID: 63383
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [i915 vga output] glitchy output when attaching
                    external monitor
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: christopherarges at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 77747
  --> https://bugs.freedesktop.org/attachment.cgi?id=77747&action=edit
Glitchy Output

If I attach an external monitor to my Lenovo Thinkpad T420 and type the
following command:
    xrandr --output VGA1 --auto --primary --output LVDS1 --off
I get glitchy output as shown in the attached picture.

I have tested with a pre-built Ubuntu kernel here:
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/current/
This should be commit bae3699182027525d92b97d904578a533264b242 from the
drm-intel tree next branch.

The related launchpad bug is here:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1157678

While https://bugs.freedesktop.org/show_bug.cgi?id=57160 is linked in the bug,
I believe this is another issue. I've tested with a kernel that contains the
patch and it did not fix the issue.

My graphics card is:
2nd Generation Core Processor Family Integrated Graphics Controller [8086:116]

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