[Bug 111310] New: Failed to toggle display to mirror mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111310

            Bug ID: 111310
           Summary: Failed to toggle display to mirror mode
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: acelan at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 144961
  --> https://bugs.freedesktop.org/attachment.cgi?id=144961&action=edit
journal -b -k, the HDMI monitor fails to display after switched to mirror mode

OS: Ubuntu 18.04
Kernel: 5.3-rc3

XPS 13 7390 (TBT port) -> Dell WD19TB Thunderbolt Dock (Type C DP port) -> Type
C to HDMI(04b4:5210) -> HDMI Monitor

Toggle the display to mirror mode the HDMI monitor always get blank screen.
But after added drm.debug=0xe, it leads to this issue hard to be reproduced,
I've tried around 10 times to get one failure.

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