Plesae try updating your alsa drivers, as outlined here:
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules. Please
report back as to whether this solves your issue.
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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[Realtek ALC269] ALSA test tone not correctly played back; no audio on laptop
speakers but headphones does have faint audio
https://bugs.launchpad.net/bugs/637291
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