Does unmuting the following mixer control resolve the issue?
Simple mixer control 'External Amplifier',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off] <---
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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[VIA8233 - VIA 8233] Playback problem
https://bugs.launchpad.net/bugs/662252
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