AW13 OLED Monitor Brightness

monitor-backlight.sh

#!/bin/sh
path=/sys/class/backlight/intel_backlight

luminance() {
    read -r level < "$path"/actual_brightness
    factor=$((max / 100))
    ret=`printf '%d\n' "$((level / factor))"`
    if [ $ret -gt 100 ]; then
       ret=100
    fi
    printf `echo "$ret / 100" | bc -l`
}

read -r max < "$path"/max_brightness

while inotifywait -e modify "$path"/actual_brightness; do
  lm=$(luminance)
  echo -n "${lm}" > ~/.brightness
  xrandr --output eDP-1 --brightness "${lm}"
  # If the previous command failed it's because the nvidia
  # card is active and it reports different display names
  if [ $? -gt 0 ]
  then
    xrandr --output eDP-1-1 --brightness "${lm}"
  fi
done

sadly Xrandr is not supported on Chromium OS ! any alternatives in sight ?