Does muting the following control help?
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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[ICH4 - Intel 82801DB-ICH4] ALSA test tone not correctly played back
https://bugs.launchpad.net/bugs/655062
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