On the Dell Latitude, the mic mute key event is generated by wmi driver, the keycode assigned to this hotkey from kernel is KEY_MICMUTE (248), this keycode is too big for xorg to handle, in the xorg, the XF86AudioMicMute is assigned to F20.
Please refer to 4e648ea0 of xkeyboard-config.
BugLink: https://bugs.launchpad.net/bugs/1326684 BugLink: https://bugs.launchpad.net/bugs/1339998
1f6d36f keymap: Add microphone mute keymap for Dell Latitude
hwdb/60-keyboard.hwdb | 4 ++++
1 file changed, 4 insertions(+)
Upstream: github.com