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Date:      Tue, 30 Jan 2007 20:39:41 -0500
From:      Kris Kennaway <kris@obsecurity.org>
To:        Joe Vender <jvender@owensboro.net>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: FreeBSD 6.1 & 6.2 hanging and/or spontaneous rebooting
Message-ID:  <20070131013941.GA59719@xor.obsecurity.org>
In-Reply-To: <200701301920.48499.jvender@owensboro.net>
References:  <200701301920.48499.jvender@owensboro.net>

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On Tue, Jan 30, 2007 at 07:20:47PM -0600, Joe Vender wrote:
> I think I've fixed the spontaneous reboot and system hang problem I've be=
en=20
> having with FBSD 6.1 & 6.2 as described in earlier threads of the same=20
> subject. I'm now using FBSD 6.2 to send this message.
>=20
> What I did was to set a hint in /boot/device.hints and also /boot/loader.=
conf=20
> to disable acpi
> hint.acpi.0.disabled=3D"1"
>=20
> and then I set a hint to enable apm
> hint.apm.0.disabled=3D"0"
> hint.apm.0.flags=3D"0x20"
>=20
> plus I set apm and apmd to start at boot in /etc/rc.conf
> apm_enable=3D"YES"
> apmd_enable=3D"YES"
>=20
> and in /boot/loader.conf, I put
> apm_load=3D"YES"
>=20
> The messages log shows that APM is being detected, and the computer now f=
ully=20
> powers down via "shutdown -p now".
>=20
> I've a suggestion. It would be nice if freebsd could try to detect if acp=
i is=20
> supported on the computer in which it is being installed, and if none is=
=20
> found, it should completely disable acpi and then check if apm is support=
ed.=20
> It should then set the appropriate settings to enable the correct power=
=20
> management support for the computer. This would prevent this particular=
=20
> spontaneous rebooting and hanging on old computers like mine which are=20
> pre-acpi but have apm support.

It does try to detect it; the problem is apparently that your BIOS
lies and says "yep, ACPI capable!", but is in fact too buggy to use.
Look for a BIOS update if possible.

kris
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