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'


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

# 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


10.2. SDDM configuration


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.