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+## LED Brightness
+If the default settings are too bright, disable the default modules using
+`/etc/modprobe.d/led.conf`:
+
+```
+blacklist leds_gpio
+blacklist led_class
+blacklist ledtrig_heartbeat
+```
+
+and use a systemd tmpfile to configure desirable settings,
+`/etc/tmpfiles.d/led.conf`:
+
+```
+w /sys/class/gpio/export - - - - 123
+w /sys/class/gpio/gpio123/direction - - - - in
+```