Please update your alsa drivers, as explained here, and reboot:
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules
Please report back as to whether this helped.
Thanks
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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[Conexant CX20551 (Waikiki)] ALSA test tone not correctly played back - No
sound at all trough speakers
https://bugs.launchpad.net/bugs/621060
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