wiki.mbirth.de/know-how/hardware/hp-spectre-x360/_posts/2018-09-02-mute-led.md

title	language	layout	created	updated	toc	tags
hp Spectre x360 Mute LED	en	default	2018-09-02 15:15:45 +0200	2018-09-02 15:15:45 +0200	false	know-how hardware hp spectre mute led gpio

The LED in the mute key doesn't work out of the box. To enable it, add a file /etc/modprobe.d/hp-spectre.conf with the following contents:

options snd-hda-intel model=mute-led-gpio

After a reboot, the LED should light up when the audio is muted.

(Source: wiki.archlinux.org)