#!/bin/bash
if [ -f /sys/class/backlight/intel_backlight/brightness ]; then
  pV=$(cat /sys/class/backlight/intel_backlight/brightness);
  echo -n "0" >> /sys/class/backlight/intel_backlight/brightness;
  read;
  echo -n "$pV" >> /sys/class/backlight/intel_backlight/brightness;
  exit 0;
else
  exit 1;
fi