Ubuntu 20.10 on ThinkPad T14 (AMD). Microphone mute LED always stays on. How can I fix it or turn it off?

Question

I can mute and unmute the microphone just fine, but the white light on the mic mute button (F4) is on at all times. How can I make it respond to the muted/unmuted state of the microphone, or even just turn it off completely? It's very bright.

Answer 1

I am using ThinkPad P14s AMD, following works if you want to manually change it.

You can test to see if it works for you:

echo 1 | sudo tee /sys/class/leds/platform\:\:micmute/brightness

to turn it on, and

echo 0 | sudo tee /sys/class/leds/platform\:\:micmute/brightness

to turn it off.