Provide dual screen setup where needed.

For SDDM, the projector is switched off: dual_screen[0].
For Wayland, dual_screen[1] is set as primary screen.

roles/lmn_fvs/tasks/main.yml

@@ -188,6 +188,35 @@
       [General]
       loginMode=emptySession
 
+- name: Fix primary screen for class room PCs with projector
+  block:
+    - name: Switch projector off for login
+      lineinfile:
+        dest: /usr/share/sddm/scripts/Xsetup
+        line: 'xrandr --output {{ dual_screen[0] }} --off'
+    - name: Deploy fix-screen script
+      ansible.builtin.template:
+        src: lmn-fix-screen.j2
+        dest: /usr/local/bin/lmn-fix-screen
+        mode: '0755'
+    - name: Deploy fix-screen autostarter
+      ansible.builtin.copy:
+        dest: /etc/xdg/autostart/lmn-fix-screen.desktop
+        content: |
+          [Desktop Entry]
+          Name=fix-screen
+          Exec=lmn-fix-screen
+          Type=Application
+          NoDisplay=true
+  when: dual_screen is defined
+
+#- name: Avoid starting kscreen (confusing autodetection)
+#  ansible.builtin.copy:
+#    dest: /etc/xdg/kded5rc
+#    content: |
+#      [Module-kscreen]
+#      autoload=false
+#
 #- name: Disable automatic lock screen and user specific modifications
 #  ansible.builtin.copy:
 #    path: /etc/xdg/kscreenlockerrc

roles/lmn_fvs/templates/lmn-fix-screen.j2

@@ -0,0 +1,10 @@
+#!/usr/bin/bash
+#
+# Set the primary screen after login
+#
+set -eu
+
+sleep 5
+if [[ "$XDG_SESSION_TYPE" = wayland ]] ; then
+    kscreen-doctor output.{{ dual_screen[1] }}.priority.1
+fi