There are a couple mixer controls that you can try adjusting:
Simple mixer control 'Headphone Jack Sense',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'External Amplifier',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/826081
Title:
[ICH4 - Intel ICH6] ALSA test tone not correctly played back
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