Please open a terminal and run:

sudo sh -c "echo 'realtime-scheduling = no' >> /etc/pulse/daemon.conf"

Now reboot. Does the problem occur again?

** Also affects: pulseaudio (Ubuntu)
   Importance: Undecided
       Status: New

** Summary changed:

- [HDA-Intel - HDA Intel PCH, playback] No sound at all
+ [HDA-Intel - HDA Intel PCH, playback] No sound at all (ALC3246)

** Changed in: alsa-driver (Ubuntu)
       Status: New => Incomplete

** Changed in: pulseaudio (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1790416

Title:
  [HDA-Intel - HDA Intel PCH, playback] No sound at all (ALC3246)

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