updated mod_backlight to use brillo for better backlight control

scripts/mod_backlight

@@ -1,5 +1,19 @@
 #!/bin/bash
 
-if command -v backlight_control &> /dev/null; then
-    backlight_control $1
+if command -v brillo &> /dev/null; then
+	function send_notification() {
+	brightness=$(printf "%.0f\n" $(brillo -G))
+	dunstify -a "changebrightness" -u low -r 9991 -h int:value:"$brightness" -i "brightness-$1" "Brightness: $brightness%" -t 2000
+}
+
+	case $1 in
+	up)
+		brillo -A 5 -q -u 150000
+		send_notification $1
+		;;
+	down)
+		brillo -U 5 -q -u 150000
+		send_notification $1
+		;;
+	esac
 fi