AW13 OLED Set Brightness

set-backlight.sh

#!/bin/bash

sleep 1

if [ -f ~/.brightness ]
then
  read -r br < ~/.brightness
  bri=`echo "${br} * 100" | bc -l | xargs printf "%.0f\n"`
  echo $bri
  if [ ${bri} -gt 100 ]
  then
    br=1
  fi
  xrandr --output eDP-1 --brightness "${br}"
  # If the previous command failed it's because the nvidia
  # card is active and it reports different display names
  if [ $? -gt 0 ]
  then
    xrandr --output eDP-1-1 --brightness "${br}"
  fi
fi

That sounds like setting the brightness value as a percentage. If you want to run the xrandr command directly, the brightness value must be between 0 and 1 (although if you set it to 0 the screen will turn off completely!).