It seems to have no effect:

$ amixer -c 0 | grep -i auto-mute
Simple mixer control 'Auto-Mute Mode',0

$ amixer -c 0 set 'Auto-Mute Mode' Enabled
Simple mixer control 'Auto-Mute Mode',0
  Capabilities: enum
  Items: 'Disabled' 'Enabled'
  Item0: 'Enabled'

$ amixer -c 0 | grep -i auto-mute
Simple mixer control 'Auto-Mute Mode',0

Plugging and unplugging the headphones still leaves Front speakers on.

On 02/13/2013 08:31 PM, Raymond wrote:
> you have disabled the auto mute
>
> Simple mixer control 'Auto-Mute Mode',0
>   Capabilities: enum
>   Items: 'Disabled' 'Enabled'
>   Item0: 'Disabled'
>

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https://bugs.launchpad.net/bugs/1123595

Title:
  [System76 Bonobo Pro, Realtek ALC892, jack sensing] Alsa does not mute
  speakers when headphones are plugged

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