Failed to toggle display to mirror mode
Submitted by AceLan Kao
Assigned to Intel GFX Bugs mailing list
Created attachment 144961
journal -b -k, the HDMI monitor fails to display after switched to mirror mode
OS: Ubuntu 18.04
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":