Enable NONE in the i/o scheduler

2

I do something like this on my Odroid board to control the leds.

  systemd.services.setleds = {
    script = ''
      echo "Setting Odroid LEDs"
      echo none > /sys/class/leds/blue\:heartbeat/trigger
      cat /sys/class/leds/blue\:heartbeat/trigger
    '';
    wantedBy = ["multi-user.target"];
  };```