Trusty has gnome-settings-daemon 3.8.6. Support for XF86AudioMicMute was added in gnome-settings-daemon 3.9.2: https://github.com/GNOME/gnome-settings-daemon/commit/3a8beaaf380a483ce33363031d8d276c371d7af1
I believe gnome-settings-daemon (and unity-settings-daemon) need to backport that patch for XF86AudioMicMute support.
Trusty has gnome-settings- daemon 3.8.6. Support for XF86AudioMicMute was added in gnome-settings- daemon 3.9.2: /github. com/GNOME/ gnome-settings- daemon/ commit/ 3a8beaaf380a483 ce33363031d8d27 6c371d7af1
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I believe gnome-settings- daemon (and unity-settings- daemon) need to backport that patch for XF86AudioMicMute support.