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USB Type-C monitor flashes once when play a video file after unplug and re-plug the monitor

Submitted by Chintan Patel

Assigned to Intel GFX Bugs mailing list

Link to original bug (#110954)

Description

Created attachment 144604
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.

**Attachment 144604**, "dmesg logs on Chromebook with drm-tip logs enabled with 0x1e":
dmesg_with_drm-tip_chromeos.txt
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