For micmute userspace handles both micmute and f20, as Xorg cannot
handle the high keycode that the micmute key has. As such, adding the
remapping means that the key will work on Xorg clients and not just when
using wayland.
evdev:name:Eee PC WMI hotkeys:dmi:bvn*:bvr*:bd*:svnASUS*:pn*:*
evdev:name:Asus Laptop extra buttons:dmi:bvn*:bvr*:bd*:svnASUS*:pn*:*
KEYBOARD_KEY_6b=f21 # Touchpad Toggle
+ KEYBOARD_KEY_7c=f20 # Remap micmute to f20
# USB keyboard in Asus FX503VD
evdev:input:b0003v0B05p1869*