brightness.sh

#!/bin/bash

max=$(cat /sys/class/backlight/intel_backlight/max_brightness)
cur=$(cat /sys/class/backlight/intel_backlight/actual_brightness)

step=$(($max/20))

case "$1" in
    video/brightnessup)
        new=$(($cur+$step))

        if [ "$new" -gt "$max" ]; then
            new="$max"
        fi

        echo $new > /sys/class/backlight/intel_backlight/brightness
        logger "increasing backlight"
        ;;
    video/brightnessdown)
        new=$(($cur-$step))

        if [ "$new" -lt "0" ]; then
            new="0"
        fi

        echo $new > /sys/class/backlight/intel_backlight/brightness
        logger "decreasing backlight"
        ;;
esac