[Bug 115511] New: Video system crashes sometimes when plugged into dock station on Dell E7450

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=115511

            Bug ID: 115511
           Summary: Video system crashes sometimes when plugged into dock
                    station on Dell E7450
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.4.5
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: slawek at otwiera.cz
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 211021
  --> https://bugzilla.kernel.org/attachment.cgi?id=211021&action=edit
Previous boot dmesg: journalctl -k -b -1

* Facts

** Video freezes from time to time (randomly) after Dell E7450 being plugged
into docking station with two external FHD displays attached (DP1-1 and DP1-2
in xrandr).

** I've got background shell script running which detects udev change and calls
xrandr to enable two external displays - so this issue might happend after
xrandr command or after plug-event itself (not really able to verify, it will
be difficult to work without it running)

** I was hitting shutdown button after crash, so there might be
shutdown-related events in log (at the end, I've hold it until system halted)

* Guesses

** According to LEDs (not tested with SSH yet)  system is responding normally
after video freeze - disk LED blinks from time to time.

** One of external monitors might be already reading „empty signal” (if I
understand correctly, it is no longer reporting that there is no signal, but
instead it acts like there is perfectly black image displayed)

* Attachments

** dmesg log from the crashed boot.

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