Public bug reported:
Package: sddm
Version: Ubuntu 25.10 (Questing) 0.21.0+git20250502.4fe234b-2ubuntu1
Description:
When a user configures their display layout in KDE System Settings → Display
and Monitor and clicks Apply, the configuration is saved to
~/.config/kwinoutputconfig.json. However SDDM, which runs as its own system
user, has no access to this file and retains its own independent display
configuration.
On a dual monitor system this results in the SDDM login screen displaying
monitors in a different arrangement than the KDE desktop session. Specifically,
mouse cursor movement between monitors on the login screen does not match the
configured layout in the desktop session, making the login screen confusing to
use.
Steps to reproduce:
Install Kubuntu 25.10 on a system with two monitors
Configure monitor arrangement in KDE System Settings → Display and Monitor,
including relative positioning
Apply the configuration
Log out or reboot
Observe that the SDDM login screen uses a different monitor arrangement than
configured
Expected behaviour:
SDDM should use the same monitor arrangement as configured in KDE display
settings, either by automatically syncing on apply, or by providing a UI option
to apply settings to the login screen.
Actual behaviour:
SDDM retains its own independent display configuration. The workaround requires
manually copying ~/.config/kwinoutputconfig.json to
/var/lib/sddm/.config/kwinoutputconfig.json with correct ownership set to the
sddm user.
Workaround:
in bash: sudo mkdir -p /var/lib/sddm/.config
sudo cp ~/.config/kwinoutputconfig.json
/var/lib/sddm/.config/kwinoutputconfig.json
sudo chown -R sddm:sddm /var/lib/sddm/.config
Additional information:
Laptop screen: eDP-1 (1920x1080)
External monitor: HDMI-A-1 (1920x1080)
Session type: Wayland
** Affects: sddm (Ubuntu)
Importance: Undecided
Status: New
** Tags: display kde multiple-monitors sddm
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https://bugs.launchpad.net/bugs/2142661
Title:
SDDM display layout not updated when KDE display configuration is
changed
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