Closing as Invalid. The audio issue was caused by warm reboot from 
Windows. A full power cycle (shutdown from Windows, then boot Ubuntu) 
resolves the issue. No kernel changes are needed.

** Changed in: linux (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/2158074

Title:
  Dynabook RA/ZYB (AMD ACP 6.3, subsystem 3100:f07b): internal speakers
  silent, headphones have periodic dropouts

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