[Bug 72795] New: Dell dock DVI knocks out DP when unplugged.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72795

          Priority: medium
            Bug ID: 72795
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Dell dock DVI knocks out DP when unplugged.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: benwhitten at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 90880
  --> https://bugs.freedesktop.org/attachment.cgi?id=90880&action=edit
dmesg of display knockout

I have a Dell Latitude E7440 connected to a Dell E-Port WV7MW dock, which feeds
two Dell P2214H monitors, one using DP on the dock the other using DVI.

The DVI screen suffers corruption from time to time, pixels get shifted then it
blinks off then comes back and is fine for ages, I have also noticed corruption
while unplugging in the form of lots of red pixels, might not be relevant to
this.

Both screens are mirrored and I am unable to set them seperatly from arandr,
whats identified as DP2 always gets output on both screens.
I have also found that while unplugging the docks display port and re plugging
results in expected screen doing off and back on, however unplugging the docks
DVI results in both screens being knocked out and replugging has no effect both
monitors stay off, even with replugging the DP. Logging out and loging back in
fixes it.

Attached is a dmesg with debug=14 of starting up, unplugging DP, replugging,
unplugging DVI, replugging, and then a relog.

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