[Bug 98919] New: [Broadwell] Monitor on DP docking station causes odd behavior

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98919

            Bug ID: 98919
           Summary: [Broadwell] Monitor on DP docking station causes odd
                    behavior
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: inform at tiker.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I'm not sure I've got this down to a repeatable pattern yet, but the behavior
is certainly "odd". I've got a ThinkPad X250 with an associated docking
station. I have a Dell P2715Q (4K) monitor plugged into a display port on the
docking station. The monitor seems to be detected OK and work fine upon first
being plugged in, and it certainly works OK if it's plugged in from boot.

Things start to awry when the monitor is disconnected (either by removing the
computer from the docking station, or by removing the monitor plug). At that
point, "xrandr" starts taking a long time and, irrespective of the actual
monitors plugged in, reports a phantom monitor on the port where the
now-disappeared monitor was:

DP-2-2 connected 1024x768+1920+0 (normal left inverted right x axis y axis) 0mm
x 0mm
   1024x768      60.00* 
   800x600       60.32    56.25  
   848x480       60.00  
   640x480       59.94  

At this point, no further monitor plugging/unplugging seems to have any effect.
This is on Debian's kernel 4.9rc5. I'll test with 4.6 next and see what I get. 

Related (but not certainly identical) bugs include bug 98211.

Debian bug template:
https://gist.github.com/inducer/4a382ef00efc10fe1104f701267fe999
(kernel/software versions, logs, etc.)

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