From owner-freebsd-acpi@FreeBSD.ORG  Tue Sep 20 18:02:56 2005
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Date: Tue, 20 Sep 2005 11:02:48 -0700
From: Nate Lawson <nate@root.org>
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To: Maxim Maximov <mcsi@mcsi.pp.ru>
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Cc: acpi@freebsd.org
Subject: Re: Hard hang with powerd
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Maxim Maximov wrote:
> Hi, all.
> 
>     I've got hard hangs with latest CURRENT in a few seconds after 
> enabling powerd. Here's loader.conf:
> 
> # cat /boot/loader.conf
> hw.psm.synaptics_support=1
> debug.mpsafevfs=1
> acpi_perf_load="YES"

This option is not needed any more.  There is no acpi_perf.ko any more.

I suspect the multi-CPU writes are the issue, as Bruno mentioned.

-- 
Nate