#!/bin/sh
b=$(cat /sys/class/backlight/amdgpu_bl0/brightness)

a=0

if [ $b -gt 0 ]; then
  while [ $a -lt 10 -a $b -gt 0 ]; do
    b=`expr $b - 1`
    echo $b | sudo tee /sys/class/backlight/amdgpu_bl0/brightness
    a=`expr $a + 1`
  done
fi