10. Login Screen (sddm)

SDDM login screen may be a bit finicky during configuration. Applying changes tend to overwrite custom background setup. Login screen should be configured after all UI settings have been set.

10.1. Multiple Monitors

SDDM requires setup for multiple monitors to reflect the same configuration when on the desktop.

Get current desktop monitor configuration.

xrandr | grep ' connected'

Note

Output display format is {SCREEN WIDTH}x{SCREEN HEIGHT}x{X POS}x{Y POS}.

Set the display configuration for SDDM and ensure Xsetup is run on launch.

0755 root root /usr/share/sddm/scripts/Xsetup

#!/bin/bash

# 3:DP-0 connected 2560x1440+5120+0 (normal left inverted right x axis y axis) 597mm x 336mm
# 17:DP-2 connected primary 2560x1440+2560+0 (normal left inverted right x axis y axis) 598mm x 336mm
# 23:DP-4 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm

xrandr --output DP-4 --mode 2560x1440 --pos 0x0 --rotate normal \
       --output DP-2 --mode 2560x1440 --pos 2560x0 --rotate normal \
       --output DP-0 --mode 2560x1440 --pos 5120x0 --rotate normal

0644 root root /etc/sddm.conf

DisplayCommand=/usr/share/sddm/scripts/Xsetup

Reference

10.2. SDDM configuration

Note

apply plasma settings after setting background and any other theme UI settings. This will apply the current UI settings (arc dark) to the Breeze login screen; this should match the lockscreen.