Comment 44 for bug 1157678

Created attachment 77747
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]