1 files changed, 32 insertions, 0 deletions
diff --git a/utils/backlight_default.sh b/utils/backlight_default.sh
new file mode 100755
index 0000000..b79e680
--- /dev/null
+++ b/utils/backlight_default.sh
@@ -0,0 +1,32 @@
+#!/bin/sh
+set -e
+
+backlight_sys_dir="/sys/class/backlight/intel_backlight"
+
+read -r max_brightness < "${backlight_sys_dir}/max_brightness"
+read -r curr_brightness < "${backlight_sys_dir}/brightness"
+
+if ! groups | grep -q backlight; then
+    echo "User is not in the backlight group"
+    exit 1
+fi
+
+if [ "$#" -eq 0 ] ; then
+    # set to half that of 'max_brightness'
+    echo $((max_brightness / 2)) > "$backlight_sys_dir"/brightness
+    exit 0
+fi
+
+case "$1" in
+    up) increment="+ 10" ;;
+    down) increment="- 10" ;;
+    *) exit 1 ;;
+esac
+
+new_brightness=$(($curr_brightness $increment))
+
+if $((new_brightness < 1)) || $((new_brightness > $max_brightness)); then
+    exit 1
+else
+    echo "$new_brightness" > "$backlight_sys_dir"/brightness
+fi