[Bug 100619] New: Thinkpad / Intel drm: problems after docking laptop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100619

            Bug ID: 100619
           Summary: Thinkpad / Intel drm: problems after docking laptop
           Product: DRI
           Version: DRI git
          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: bugs.freedesktop.org at r123.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 130757
  --> https://bugs.freedesktop.org/attachment.cgi?id=130757&action=edit
dmesg output

This happened on a ThinkPad T460p with Intel HD 530and the following software
versions:
* stock Kernel 4.10.8
* Mesa 13.0.6 
* x11-intel drivers from git from 20170313
* libdrm 2.4.75
* xorg-server 1.19.2

I had problems after docking the laptop in to the docking station, which was
attached to two screens (one through DP, one through HDMI): the external
screens stayed black and the laptop was frozen. After undocking it became
responsive again. Problem was reproducible and appeared also after hibernating
and waking up the laptop.

Please find dmesg output attached, which contains a lot of drm related error
messages.

$ cat /sys/class/drm/card0/error
no error state collected

No relevant messages in Xorg.log

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