Simple init script that saves and restores display brightness

brightness

#!/bin/sh

### BEGIN INIT INFO
# Provides:         brightness
# Required-Start:   $local_fs
# Required-Stop:
# Default-Start:    S
# Default-Stop:     0 6
# Short-Description Provides display brightness persistency on laptop computers
# Description: Provides display brightness persistency on laptop computers
### END INIT INFO

. /lib/lsb/init-functions

N=/etc/init.d/brightness

STATUS_FILE=/etc/acpi/brightness
SYS_FILE=/sys/class/backlight/acpi_video0/brightness

case "$1" in
    start)
        if [ -e $STATUS_FILE ]; then
            cat $STATUS_FILE > $SYS_FILE
        fi
        ;;
    stop)
        cat $SYS_FILE > $STATUS_FILE
        ;;
    status)
        echo "Current brightness level: $(cat $SYS_FILE)"
        ;;
    reload|restart/force-reload)
        ;;
    *)
        echo "Usage: $N {start|stop|restart|force-reload|status}" >&2
        exit 1;
        ;;
esac

exit 0