Please update your alsa drivers as explained here:
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules^. Once
you have these installed and reboot, please check audio playback again,
and report back as to whether your issue is resolved.
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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[VIA VT1708S] ALSA test tone not correctly played back
https://bugs.launchpad.net/bugs/626135
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