[Bug 299139] Restore display audio when playback starts after monitor sleep

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=299139

            Bug ID: 299139
           Summary: Restore display audio when playback starts after
                    monitor sleep
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: david@crap.solutions

A display audio codec can remain powered down after monitor sleep. New
playback then starts without sound. Waking the codec can also leave its
output amplifier muted.

Wake the codec before starting a new audio stream when it is not fully
powered. After waking it, restore the saved amplifier settings, preserving
the user's volume and mute choices.

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