Added brightness fix

overlay/opt/emcomm-tools/sbin/panasonic-set-brightness.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+#
+# Author  : Gaston Gonzalez
+# Date    : 16 January 2023
+# Updated : 16 March 2024
+# Purpose : Fix screen brightness on Panasonic hardware
+#
+# Note: This fix is based on the following article:
+# https://www.bobjohnson.com/bloghow-to-install-ubuntu-on-a-panasonic-toughbook-cf31/
+
+PATH=/opt/emcomm-tools/bin:$PATH
+
+WatchDriver="/sys/class/backlight/panasonic"
+PatchDriver="/sys/class/backlight/intel_backlight"
+
+if [ ! -d $WatchDriver ]; then
+    et-log  "This is not a Pansonic system. Exiting."
+    exit 1
+fi
+
+if [ ! -d $PatchDriver ]; then
+    et-log "Patch driver directory does not exist: ${PatchDriver}"
+    exit 1
+fi
+
+# Get maximum brightness values
+WatchMax=$(cat $WatchDriver/max_brightness)
+PatchMax=$(cat $PatchDriver/max_brightness)
+
+SetBrightness () {
+    # Calculate watch current percentage
+    WatchAct=$(cat $WatchDriver/actual_brightness)
+    WatchPer=$(( WatchAct * 100 / WatchMax ))
+    # Reverse engineer patch brightness to set
+    PatchAct=$(( PatchMax * WatchPer / 100 ))
+    echo $PatchAct | sudo tee $PatchDriver/brightness
+}
+
+# When machine boots, set brightness to last saved value
+SetBrightness
+# Wait forever for user to press Fn keys adjusting brightness up/down.
+while (true); do
+    /usr/bin/inotifywait --event modify $WatchDriver/actual_brightness
+    SetBrightness
+done