acpid brightness handler

sudo pacman -S acpid
sudo systemctl enable acpid
check ls /sys/class/backlight/ to confirm  bl_dev=/sys/class/backlight/intel_backlight/


sudo leafpad  /etc/acpi/handlers/bl
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#!/bin/sh
bl_dev=/sys/class/backlight/intel_backlight/
step=1

case $1 in
  -) echo $(($(< $bl_dev/brightness) - $step)) >$bl_dev/brightness;;
  +) echo $(($(< $bl_dev/brightness) + $step)) >$bl_dev/brightness;;
esac

chmod +x /etc/acpi/handlers/bl

 -------------------------------------------------------------------------------------------------------------
  sudo leafpad  /etc/acpi/events/bl_d

event=video/brightnessdown
action=/etc/acpi/handlers/bl -
 -------------------------------------------------------------------------------------------------------------
  sudo leafpad  /etc/acpi/events/bl_u
event=video/brightnessup
action=/etc/acpi/handlers/bl +
 -------------------------------------------------------------------------------------------------------------
 

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