I own HP 15-db0038nc laptop. It has LED on mute key, which indicates if sound is muted or not. It works on Windows, but it doesn't work in Linux (Xubuntu 18.04). I don't see it in alsamixer. This is what I see when i use aspi_listen and press mute key:

button/mute MUTE 00000080 00000000 K

Any ideas what should I do? Thanks in advance.

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