What: /sys/class/leds/<led>/device/brightness
Date: July 2020
KernelVersion: 5.9
-Contact: Marek BehĂșn <marek.behun@nic.cz>
+Contact: Marek BehĂșn <kabel@kernel.org>
Description: (RW) On the front panel of the Turris Omnia router there is also
a button which can be used to control the intensity of all the
LEDs at once, so that if they are too bright, user can dim them.