OOKB - Olaf's Own Knowledge Base

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===== Multiple monitor setup correct login screen order =====
In a multi-monitor configuration, the order of the monitors might be different on the logon screen and KDE Plasma (Wayland).\\

The configuration in Debian 13 Trixie is even a little more tricky:\\
while SDDM is running in a X11 session, you might want to run the desktop session in Wayland.\\
xrandr might use different output device names in X11 and Wayland.\\

== X11 ==

<code bash>
xrandr | grep -w connected

DP-2 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
DP-4 connected primary 3440x1440+2560+0 (normal left inverted right x axis y axis) 797mm x 333mm
</code>
== Wayland ==
<code bash>
xrandr | grep -w connected

DP-2 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
DP-3 connected primary 3440x1440+2560+0 (normal left inverted right x axis y axis) 797mm x 333mm

</code>

To correct the monitor configuration first find the configuration on the desktop, but ensure you started the desktop session with Plasma (X11) not Plasma (Wayland).
Open a bash as user and run:
<code bash>
xrandr | grep -w connected
</code>
<code>
DP-2 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
DP-4 connected primary 3440x1440+2560+0 (normal left inverted right x axis y axis) 797mm x 333mm
</code>

DP-2 is the left monitor\\
DP-4 is the right monitor\\

This information can be used to correct the SDDM configuration in ''/usr/share/sddm/scripts/Xsetup''. At the end of the script add:
<code bash>
xrandr --output DP-2 --mode 2560x1440 --pos 0x0 --rotate normal --output DP-4 --mode 3440x1440 --pos 2560x0 --rotate normal
</code>

Ensure /etc/sddm.conf.d/kde_settings.conf and /etc/sddm.conf contain:\\
<code bash>
[X11]
Xsetup=/usr/share/sddm/scripts/Xsetup
</code>

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