I have just noticed that

control.# {
                iface MIXER
                name 'Auto-Mute Mode'
                value Line-Out+Speaker
                comment {
                        access 'read write'
                        type ENUMERATED
                        count 1
                        item.0 Disabled
                        item.1 'Speaker Only'
                        item.2 Line-Out+Speaker
                }
        }

is missing from the output post at
https://bugs.launchpad.net/ubuntu/+source/alsa-
driver/+bug/941219/comments/11 for alsactl info, thus not enabling the
switch in alsamixer.  Anyone know how and where this control can be
added to enable the auto-mute switch?  If I remove
/var/lib/alsa/asound.state and run command alsactl store it replaces the
settings without "Auto-Mute Mode".  Where is the alsactl getting the
settings from to enable these controls?

** Summary changed:

- Speaker Sound does not disable when Headphones are connected. Ubuntu 12.04 
LTS Official Release
+ Speaker Sound does not mute when Headphones are connected. Ubuntu 12.04 LTS 
Official Release. Missing Auto-Mute Mode in alsamixer.

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https://bugs.launchpad.net/bugs/941219

Title:
  Speaker Sound does not mute when Headphones are connected. Ubuntu
  12.04 LTS Official Release. Missing Auto-Mute Mode in alsamixer.

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