According to the info, what you have on the front side is a line out
jack, rather than internal speakers. This is why auto-mute is not
enabled in the kernel.
However, that "Analog Output" has disappeared is probably something we
can work around. The problem is inconsistent volume control naming in
the driver, and in PulseAudio we choose the naming that works for most
people, and you're one of the people where the default does not work
correctly.
Open
/usr/share/pulseaudio/alsa-mixer/paths/analog-output-speaker.conf
Change:
[Element Front]
switch = mute
volume = merge
override-map.1 = all-front
override-map.2 = front-left,front-right
To:
[Element Front]
switch = ignore
volume = ignore
...and reboot to try the new settings. Please report back to tell us if
this worked out for you. Thanks!
** Changed in: alsa-driver (Ubuntu)
Status: Triaged => Incomplete
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https://bugs.launchpad.net/bugs/871633
Title:
[IDT 92HD75B3] Line out does not mute internal speakers
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