Have you tried updating your alsa drivers, as outlined here:
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules^
If not, please update as above, and report back as to whether this
helps.
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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0x103c360b Conexant CX20583 (Pebble HSF) Internal mic not functional
https://bugs.launchpad.net/bugs/587388
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