From owner-freebsd-mobile@FreeBSD.ORG  Sun Mar 25 17:46:52 2007
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Date: Sun, 25 Mar 2007 12:17:30 -0500
From: Dan Olson <danolson@visi.com>
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To: Peter Jeremy <peterjeremy@optushome.com.au>
References: <20070317232611.GA858@turion.vk2pj.dyndns.org>	<200703211020.07979.jhb@freebsd.org>	<20070324120157.GA847@turion.vk2pj.dyndns.org>	<200703240852.06127.jhb@freebsd.org>
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Cc: freebsd-mobile@freebsd.org
Subject: Re: Problems booting FreeBSD on a Compaq Pavillion V6107au
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Peter Jeremy wrote:
> On 2007-Mar-24 08:52:05 -0400, John Baldwin <jhb@freebsd.org> wrote:
>> That's because amd64 doesn't do the PnPBIOS stuff.  Can you get boot -v
>> dmesg's from amd64 with ACPI on and ACPI off?
> 
> Attached is a verbose dmesg with ACPI off.
> 
> I'm not sure how to manage a dmesg with ACPI on because it hangs (needs
> forced power-off to recover), it doesn't have a serial port and I can't
> even reliably scroll back to see what was output.  I have added some
> debug printfs and tracked the hang as far as xpt_config().  (I notice
> that there are sbp timeouts within the xpt_config with ACPI disabled
> and I wonder if these are linked).  I will continue to investigate.
> 
> ------------------------------------------------------------------------
snip... boot log

At the boot loader prompt, try entering "set hint.apic.0.disabled=1".

This may be related to my trouble with an HP dv6119us which I reported 
in PR "i386/104678: SMP not working on Turion XP Laptop"

Dan