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Failed to toggle display to mirror mode

Submitted by AceLan Kao

Assigned to Intel GFX Bugs mailing list

Link to original bug (#111310)

Description

Created attachment 144961
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.

Attachment 144961, "journal -b -k, the HDMI monitor fails to display after switched to mirror mode":
dmesg_bad.log

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