The combination "Front Headphone" + "Headset Mic Phantom" was found on one the machines we enable. Without this patch, the headset mic appeared plugged in when nothing was plugged into the jack.
BugLink: https://bugs.launchpad.net/bugs/1513384
a6bc996 alsa-mixer: Add "Front Headphone" to headset mic path
.../alsa/mixer/paths/analog-input-headset-mic.conf | 3 +++
1 file changed, 3 insertions(+)
Upstream: cgit.freedesktop.org