#!/bin/bash
FILE=/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/brightness
INC=1
VAL=255
while true; do
	VAL=$(($VAL + $INC))
	echo $VAL > $FILE
	if [ $VAL -lt 1 ]; then
		INC=1
	fi;

	if [ $VAL -gt 4434 ]; then
		INC=-1
	fi;

	echo $INC
	echo $VAL


done