It has the same code as the Spectre x360 13, but
is located at F8 button instead of F12.
Tested on a 13-ay0xxx model.
# Spectre x360 13
evdev:atkbd:dmi:bvn*:bvr*:bd*:svnHP*:pnHPSpectrex360Convertible13*:*
- KEYBOARD_KEY_82=f20 # Fn+F12; Microphone mute button, should be micmute
+# ENVY x360 13
+evdev:atkbd:dmi:bvn*:bvr*:bd*:svnHP*:pnHPENVYx360Convertible13*:*
+ KEYBOARD_KEY_82=f20 # Microphone mute button, should be micmute
# HP Elite x2 1013 G3
evdev:atkbd:dmi:bvn*:bvr*:svnHP*:pnHPElitex21013G3:*