[Bug 95521] New: DP unplug and undocking ThinkPad produces dmesg errors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95521

            Bug ID: 95521
           Summary: DP unplug and undocking ThinkPad produces dmesg errors
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mkj at gotu.dk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I'm running latest Debian Stretch on a ThinkPad X1 Carbon 20A7 "Linux mkjlap
4.5.0-2-amd64 #1 SMP Debian 4.5.3-2 (2016-05-08) x86_64 GNU/Linux"


I often get the following dmesg error when unplugging a DP cable or undocking
from the dock:

i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment

Sometimes its accompanied with a:

[drm:intel_mst_disable_dp [i915]] *ERROR* failed to update payload -22

The system seems to work properly mostly, but sometimes, when using a cable, my
monitor doesn't seem to detect any visual and goes to standby, but xrandr
claims that the monitor is enabled. To fix this I "--off" the monitor manually
and "--auto" the monitor right after.

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