Plesae install updated alsa drivers, as explained here:
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules. Please
report back as to whether these solved your problem.
Thanks
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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[Realtek ID 665] ALSA test tone not correctly played back
https://bugs.launchpad.net/bugs/616945
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