prevent screen from blanking

v1.1 of codam-web-greeter will implement custom screensavers to prevent user interaction with the greeter while the display is turned off

Author: FreekBes

files/etc/lightdm/web-greeter.yml

@@ -26,7 +26,7 @@ branding:
 greeter:
     debug_mode: False
     detect_theme_errors: True
-    screensaver_timeout: 300
+    screensaver_timeout: -1
     secure_mode: True
     theme: codam
     icon_theme:

tasks/setup.yml

@@ -66,6 +66,26 @@
     - 'greeter-hide-users=true'
     - 'greeter-show-manual-login=true'
 
+- name: Copy display-setup hook script
+  tags: [codam.webgreeter, codam.webgreeter.setup]
+  become: true
+  template:
+    src: usr/share/42/scripts/hook-display-setup.sh.j2
+    dest: /usr/share/42/scripts/hook-display-setup.sh
+    owner: root
+    group: root
+    mode: '0500'
+
+- name: Enable display-setup hook in lightdm
+  tags: [codam.webgreeter, codam.webgreeter.setup]
+  become: true
+  lineinfile:
+    path: /etc/lightdm/lightdm.conf
+    line: display-setup-script=/usr/share/42/scripts/hook-display-setup.sh
+    insertbefore: 'session-setup-script='
+    state: present
+    regexp: '^#?display-setup-script='
+
 - name: Copy greeter-setup hook script
   tags: [codam.webgreeter, codam.webgreeter.setup]
   become: true

templates/usr/share/42/scripts/hook-display-setup.sh.j2

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+# Prevent screen from blanking, codam-web-greeter has a built-in screensaver.
+# Warning: also applies to user sessions.
+/usr/bin/xset s off
+/usr/bin/xset -dpms
+/usr/bin/xset s noblank

templates/usr/share/42/scripts/hook-greeter-setup.sh.j2

@@ -3,16 +3,14 @@
 {% if ansible_system_vendor == 'Apple Inc.' %}
 # Set brightness on Apple hardware
 # Check if the brightness-default.sh script exists in the same directory (provided by 42).
+# For some reason 42 runs this script for the greeter-setup, not display-setup hook in lightdm.
 # Could implement the same behavior, but if it changes in 42.common we'd need to change it here as well.
 # Better to just source it if it exists.
 if [ -f "$(dirname $0)/brightness-default.sh" ]; then
 	source "$(dirname $0)/brightness-default.sh"
 fi
 {% endif %}
 
-# Prevent the screen from going to sleep
-/usr/bin/xset s off
-
 # Turn on Num Lock on the keyboard
 /usr/bin/numlockx on