diff --git a/brightness b/brightness
new file mode 100755
index 0000000..c32cf89
--- /dev/null
+++ b/brightness
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# Pau Oliva Fora - pof (a) eslack (.) org
+#
+# Macbook Air 4,2 power management script 
+# copy to /etc/pm/power.d/99_macbookair and chmod 755
+#
+
+if [ $# -ne 1 ]; then
+    echo "$0 brightness (0-15)"
+    exit 1
+fi
+
+level=$1
+
+# lower brightness (value from 1 to 15)
+echo $level > /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/brightness