Please try updating your alsa drivers, as shown here:
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules. If that
doesn't help solve your issue, please obtain a log from Pulseaudio, as
outlined here: https://wiki.ubuntu.com/PulseAudio/Log.
affects ubuntu/pulseaudio
status incomplete
** Changed in: pulseaudio (Ubuntu)
Status: New => Incomplete
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[ICH - SiS SI7012] PA test tone failed (alsa tone succeeded)
https://bugs.launchpad.net/bugs/635625
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