https://bugs.kde.org/show_bug.cgi?id=411361
Bug ID: 411361
Summary: Plasma/Wayland doesn't recognize external display on
reconnected USB-C dock
Product: KScreen
Version: git
Platform: Neon Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: libkscreen
Assignee: se...@kde.org
Reporter: gvarsa...@gmail.com
Target Milestone: ---
SUMMARY
Plasma/Wayland doesn't recognize external display on reconnected USB-C dock.
STEPS TO REPRODUCE
1. Use a type-c USB w/ alt mode laptop and a dock (like Dell WD15)
2. Log in to Plasma Wayland from SDDM with the dock connected, see external
screen work right
3. Disconnect the dock, reconnect some time later
OBSERVED RESULT
External screen doesn't activate (but everything else does, e.g. sound, USB
devices, ethernet work well on reconnect)
EXPECTED RESULT
Screen should be identified and turned on
SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.16.80
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.3
Kernel Version: 5.2.0-050200rc7-generic
OS Type: 64-bit
Processors: 12 × Intel® Core™ i7-8750H CPU @ 2.20GHz
Memory: 15.4 GiB of RAM
ADDITIONAL INFORMATION
- This works on both Plasma/X11 and Gnome/Wayland.
- As far as I can tell, docks generally use DP MST to connect multiple
displays, even HDMI connection is served via DP MST. So this might be an
MST-specific issue (reconnecting works with direct HDMI on the laptop)
- Tested with Intel gfx
- I see the port appear on /sys/class/drm/card0-DP-6
$ cat /sys/class/drm/card0-DP-2/status
connected
$ cat /sys/class/drm/card0-DP-2/enabled
disabled
It seems that the display never gets enabled, even though it's found.
While searching for a bug report on this, I only found a forum entry - same
story, but with HP laptop + dock:
https://forum.kde.org/viewtopic.php?f=111&t=156876
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