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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
To: freebsd-questions@freebsd.org
Date: Wed, 3 Jun 2009 11:04:31 +0200
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Cc: "Paul B. Mahol" <onemda@gmail.com>, LoH <lordofhyphens@gmail.com>
Subject: Re: [FreeBSD 7.2-RELEASE] Audio going silent after wakeup.
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On Sunday 31 May 2009 22:06:53 LoH wrote:
> Unloading the module, letting it suspend on its own, then waking it up
> and reloading the module does not cause the symptoms to appear.
>
> Wish I knew offhand what was being called to let it suspend, and which
> state it was.

See man acpiconf. Basically you can hack /etc/rc.suspend and /etc/rc.resume to 
unload and reload the sound modules.
-- 
Mel