From owner-freebsd-acpi@FreeBSD.ORG  Wed Oct 27 22:37:18 2004
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To: joe@freebsd.org
From: "M. Warner Losh" <imp@bsdimp.com>
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cc: freebsd-acpi@freebsd.org
Subject: Re: ACPI -> shutdown
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In message: <20041027222648.GC745@genius.tao.org.uk>
            Josef Karthauser <joe@freebsd.org> writes:
: On Thu, Oct 28, 2004 at 12:12:23AM +0200, Ingo B?ngener wrote:
: > > 
: > > Is it the bios that is doing this?  It's never worked before - I'd say
: > > that you guys have fixed ACPI and that's why it is working, but why does
: > > -p not work then?
: > > 
: > 
: > I experienced the same problem with 'shutdown -p' and could fix it by setting
: > the sysctl variable "hw.acpi.disable_on_poweroff" to "0":
: > > sysctl hw.acpi.disable_on_poweroff=0
: > or adding hw.acpi.disable_on_poweroff=0  to /etc/sysctl.conf
: > 
: 
: It definitely appears that acpi isn't loaded:
: 
:     genius# sysctl -a | grep acpi
:     [nothing]
: 
: That said with things in this state suspend/resume actually works! :)

You must be using the BIOS to do this, or maybe APM.  However, ACPI S
states are quite a bit different.

Warner