#!/bin/sh

MAXBN=$(cat /sys/class/backlight/intel_backlight/max_brightness)
CURBN=$(cat /sys/class/backlight/intel_backlight/brightness)

if [ "$CURBN" -lt "$MAXBN" ]; then
  CURBN=$(( $CURBN-78 ))
  echo "$CURBN" > /sys/class/backlight/intel_backlight/brightness
  notify-send Brightness "${CURBN}/${MAXBN}" -t 200
fi