https://bugs.kde.org/show_bug.cgi?id=450068
Bug ID: 450068
Summary: Some monitor-related settings are lost after external
monitor re-connected in wayland session
Product: plasmashell
Version: 5.24.0
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: Multi-screen support
Assignee: plasma-b...@kde.org
Reporter: notsync...@163.com
CC: aleix...@kde.org, notm...@gmail.com
Target Milestone: 1.0
SUMMARY
Some settings, such as tablet target display, and desktop wallpapers, will
restore to default after external monitor reconnected or system rebooted in
wayland session (X11 not tested).
I have 3 monitors connected to a laptop through a USB type-c to 3 HDMI
connector, two of them are normal 1080p displays, and one of them is a drawing
tablet.
After some digging I found these was caused by the drm output name changing
after reconnection.
Before reconnect:
ls /sys/class/drm:
card0/ card0-DP-1/ card0-DP-2/ card0-DP-3/ card0-DP-4/ card0-DP-5/
card0-eDP-1/ renderD128/ version
After reconnect:
ls /sys/class/drm:
card0/ card0-DP-1/ card0-DP-2/ card0-DP-6/ card0-DP-7/ card0-DP-8/
card0-eDP-1/ renderD128/ version
You can see the external display connector names are changed from 3,4,5 to
6,7,8. More reconnects will increase these number.
While in the .config/plasmashellrc and .config/kcminputrc, I found the displays
are identified by the connector name:
[ScreenConnectors]
0=DP-3
2=DP-4
3=DP-5
4=DP-7
5=DP-8
6=DP-6
[Libinput][9580][109][HUION Huion Tablet_GS1161]
OutputName=DP-3
[Libinput][9580][109][HUION Huion Tablet_GS1161 Pen]
OutputName=DP-5
I guess these may be the problem. Connector names are changed after reconnect,
thus the settings lost. Maybe we could use some more persistent things such as
the monitor's serial number to identify them?
STEPS TO REPRODUCE
1. Set a wallpaper for an external monitor connected through type-c
connector/Set tablet target display to an external monitor connected through
type-c connector
2. Unplug and replug the external monitor
3. The wallpaper restored to default wallpaper/Tablet target display settings
restored to default
OBSERVED RESULT
Wallpaper/tablet settings are keeped
EXPECTED RESULT
Wallpaper/tablet settings are restored to default
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Archlinux (Wayland session)
(available in About System)
KDE Plasma Version: 5.24.0
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
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