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.
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 .
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.
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.