Linux 5.19.4-200.fc36.x86_64 cause problem with microphone led on Thinkpad X1 Carbon gen. 9

The Last kernel update broke microphone’s led status built on the Thinkpad X1 carbon 9’s keyboard.

Led status is always off, but the button works correctly.

If I execute:
echo 1 | sudo tee /sys/class/leds/platform\:\:micmute/brightness
led turns on correctly, but If I use again the button, led go off again for ever.

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5.19.6 is out now. It might be worthwhile to see if the updated kernel fixes this for you.

I’m currently on 5.19.7, but the bug is still there :slightly_frowning_face:.

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I just noticed this as well. I thought it was an issue with a Bluetooth mic but not I’m not so sure.

Main audio mute light works fine, just the mic mute light isn’t working.

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Listing the triggers using the sys file system I can see this:
... rfkill-none audio-mute [audio-micmute] rfkill0 ...

So here it seems all ok.

Just for testing, I tried to overwrite this kernel object, selecting a new trigger associated to the led: “audio-mute”.

Now When I press the mute button, the micmute bottom “works”: it turns on and off correctly together with the mute button.

So, the problem is only with the “audio-micmute” trigger.