{ pkgs, ... }:

{
  environment.systemPackages = with pkgs; [ brightnessctl ];

  services.udev.extraRules = ''
    ACTION=="add", SUBSYSTEM=="backlight", RUN+="${pkgs.coreutils-full}/bin/chgrp video /sys/class/backlight/%k/brightness"
    ACTION=="add", SUBSYSTEM=="backlight", RUN+="${pkgs.coreutils-full}/bin/chmod g+w   /sys/class/backlight/%k/brightness"
    ACTION=="add", SUBSYSTEM=="leds",      RUN+="${pkgs.coreutils-full}/bin/chgrp input /sys/class/leds/%k/brightness"
    ACTION=="add", SUBSYSTEM=="leds",      RUN+="${pkgs.coreutils-full}/bin/chmod g+w   /sys/class/leds/%k/brightness"
  '';
}