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#1 2021-07-25 20:52:26

Registered: 2009-09-28
Posts: 67

Thinkpad microphone mute button does not work

I have a thinkpad T510.  It features a separate button to mute the microphone.  The button has an orange LED.

The first issue is that the button doesn't seem to do anything.  When I press it, the LED light does not turn on or off.




outputs nothing.

I have an external thinkpad trackpoint keyboard II with the microphone mute button assigned to F4.  When I press Function+F4 on that keyboard, nothing happens either.

I can mute the microphone from the sound menu GUI, but this has no effect on the LED.

I can turn the LED on or off with:

echo 1 | sudo tee /sys/class/leds/platform\:\:micmute/brightness
echo 0 | sudo tee /sys/class/leds/platform\:\:micmute/brightness

My grub linuxcommand currently looks like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet resume=UUID=73e0d726-fedf-41ea-8ede-64b1ed94707d"

I have also tried this:

"quiet acpi_osi=linux resume=UUID=73e0d726-fedf-41ea-8ede-64b1ed94707d"

Everything I have read seems to point to this button just not being supported on the kernel level at all, but it's all 10+ year old posts I'm seeing.

I could really use help to get this button working, if it is even possible.


#2 2021-08-02 10:08:17

Registered: 2014-08-03
Posts: 157

Re: Thinkpad microphone mute button does not work

I think I'm experiencing the same issue on my T410. It seems to be related to the alsa-ucm-conf package. See this forum thread and this upstream bug report.

However, that's just for the LED I think. The button itself is working for me (I assigned it to toggle Pulseaudio mic settings). It's just that the mic state isn't being reflected with the LED light as it used to be.


#3 2021-08-04 17:07:25

From: Antelope Valley
Registered: 2020-12-03
Posts: 7

Re: Thinkpad microphone mute button does not work

T420 here, reporting the same issue all of a sudden. Might be my audio card is staring to fail as sometimes when I boot I get no output devices detected, and sometimes it works just fine.

He/him, they/them | Better to be laughed at than wrong. | T420 and T460 running Arch!


#4 2021-08-27 12:18:04

Registered: 2021-08-27
Posts: 1

Re: Thinkpad microphone mute button does not work

T450. The same. Can disable/enable through pavucontroll, but cant do it using Fn + F4. Indicator is on

Last edited by mertv0e (2021-08-27 12:18:28)


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