From owner-freebsd-current@FreeBSD.ORG  Tue Aug 24 17:14:23 2004
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Date: Tue, 24 Aug 2004 19:14:18 +0200
From: Hanspeter Roth <hampi@rootshell.be>
To: freebsd-current@freebsd.org
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Subject: Re: ACPI problem with 5.3-BETA1 on Toshiba Portege 3110CT
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  On Aug 24 at 18:16, Christian Laursen spoke:

> Today I upgraded my laptop to FreeBSD 5.3-BETA1.
> 
> When I boot it with ACPI enabled the fan is running constanly,
> even though the machine is completely idle.
> 
> When booted without ACPI it only runs when the machine is busy
> as expected.

Have you tried with sysctl debug.witness_watch=0 and/or
debug.witness_trace=0 ?

-Hanspeter