To execute a script when the button is pressed:
$ cat /etc/acpi/events/lenovo-mutemic 
event=ibm/hotkey HKEY 00000080 0000101b
action=/etc/acpi/lenovo-mutemic.sh

/usr/share/acpi-support/key-constants is based on
/usr/include/linux/input.h


There is a KEY_MUTE defined, but no KEY_MICMUTE...
/usr/include/linux/input.h
#define KEY_MUTE                113

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https://bugs.launchpad.net/bugs/728310

Title:
  Microphone mute not supported

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