I have found some Realtek codec-specific mixer control information, I have also
attached my work computers alsamixer settings as you can see from this image
the auto-mute is present and working fine.
Realtek codecs
* Channel Mode
This is an enum control to change the surround-channel setup,
appears only when the surround channels are available.
It gives the number of channels to be used, "2ch", "4ch", "6ch",
and "8ch". According to the configuration, this also controls the
jack-retasking of multi-I/O jacks.
* Auto-Mute Mode
This is an enum control to change the auto-mute behavior of the
headphone and line-out jacks. If built-in speakers and headphone
and/or line-out jacks are available on a machine, this controls
appears.
When there are only either headphones or line-out jacks, it gives
"Disabled" and "Enabled" state. When enabled, the speaker is muted
automatically when a jack is plugged.
When both headphone and line-out jacks are present, it gives
"Disabled", "Speaker Only" and "Line-Out+Speaker". When
speaker-only is chosen, plugging into a headphone or a line-out jack
mutes the speakers, but not line-outs. When line-out+speaker is
selected, plugging to a headphone jack mutes both speakers and
line-outs.
** Attachment added: "Screenshot from 2012-05-01 12:43:55.png"
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/941219/+attachment/3122714/+files/Screenshot%20from%202012-05-01%2012%3A43%3A55.png
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https://bugs.launchpad.net/bugs/941219
Title:
Speaker Sound does not disable when Headphones are connected. Ubuntu
12.04 LTS Official Release
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