[Bug 205979] Raspberry Pi2 loses audio after some time

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205979

            Bug ID: 205979
           Summary: Raspberry Pi2 loses audio after some time
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: karl at denninger.net

After some (relatively short) period of time on 11-Current with the Raspberry
Pi2 audio fails in a "mute" state.  Some programs attempting to access audio
(e.g. mpg321) will print a diagnostic on the console, others (e.g. espeak)
simply hang.

If there is a diagnostic it is of the form:

pcm0: chn_write(): pcm0:virtual:dsp0.vp0: play interrupt timeout, channel dead

There appears to be no way to clear this condition once it occurs other than a
reboot.

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