[Bug 110954] New: USB Type-C monitor flashes once when play a video file after unplug and re-plug the monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110954

            Bug ID: 110954
           Summary: USB Type-C monitor flashes once when play a video file
                    after unplug and re-plug the monitor
           Product: DRI
           Version: DRI git
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chintan.m.patel at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 144604
  --> https://bugs.freedesktop.org/attachment.cgi?id=144604&action=edit
dmesg logs on Chromebook with drm-tip logs enabled with 0x1e

Steps to reproduce this issue:
1. Boot chromebook/Ubuntu 16.04 to OS.
2. Connect type-c cable to laptop.
3. Plug DP to MST Display
4. Switch sound output to speaker.
5. Play a local video or music (not suggested Youtube). OR "speaker_test" from
command line 
6. Close the player.
7. Unplug type-c cable then plug cable in about 5~10s.
8. Play a local video or music again.
9. MST monitor will flash once when playing multimedia. <------issue

Steps to reproduce on Ubuntu 16.04 OS:
1. Boot Ubuntu OS
2. Connect Display with Solomon Dock
3. Make sure to select HDMI from audio settings ==> Check if issue happens??
4. Play video ==> Check if issue happens??


Issue happens on KBL/WHL as well as with SST monitor, although reproduction
rate is low. High reproduction rate(90%) if done using S2718D and Solomon dock.

Issue happens with drm-tip SH1 034e3ac6a2d1 also.

Attaching the logs with Chrome OS Kernel as well as with drm-tip.

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