I'll assume that you needed to update your BIOS to fix some other
problem. I suggest you try updating your alsa drivers, as outlined here:
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules. Please
report back as to whether this helped at all.
affects ubuntu/pulseaudio
status incomplete
** Changed in: pulseaudio (Ubuntu)
Status: New => Incomplete
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No headphone output after BIOS upgrade (A05) on Dell Latitude E6510
https://bugs.launchpad.net/bugs/638152
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