Comment 5 for bug 1731940

A possible work-around: Update the jack's description to PulseAudio, as shown:

Create the file `/usr/share/pulseaudio/alsa-mixer/paths/iec958-stereo-output.conf` and populate it with:

```
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of the
# License, or (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.

[General]
description = Headphones + Digital Output (S/PDIF)

[Element IEC958]
switch = mute
```

Then set the model definition at `/etc/modprobe.d/sound.conf` with the following entries:

`options snd-hda-intel model=no-primary-hp enable=1 index=0`

When done, issue a reboot.

For current HDA model lists, see http://git.alsa-project.org/?p=alsa-kernel.git;a=blob;f=Documentation/sound/alsa/HD-Audio-Models.txt;hb=HEAD.

Will test and report back.