{
  pkgs,
  tiny-dfr ? pkgs.tiny-dfr
}:
  assert tiny-dfr.version == "0.3.1";
{
  services.udev.packages = [ tiny-dfr ];
  systemd.services.tiny-dfr = {
    enable = true;
    description = "tiny-dfr";
    after = ["systemd-user-sessions.service" "getty@tty1.service" "plymouth-quit.service" "systemd-logind.service" "dev-tiny_dfr_display.device" "dev-tiny_dfr_backlight.device" "dev-tiny_dfr_display_backlight.device"];
    wantedBy = ["multi-user.target"];
    bindsTo = ["dev-tiny_dfr_display.device" "dev-tiny_dfr_backlight.device" "dev-tiny_dfr_display_backlight.device"];
    startLimitIntervalSec = 30;
    startLimitBurst = 2;
    serviceConfig = {
      ExecStart = "${tiny-dfr}/bin/tiny-dfr";
      Restart = "always";
    };
  };
}