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Date: Tue, 14 Dec 2010 15:57:07 +0200
From: Andriy Gapon <avg@freebsd.org>
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To: Jeremy Chadwick <freebsd@jdc.parodius.com>
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Cc: freebsd-stable@freebsd.org, Steven Hartland <killing@multiplay.co.uk>
Subject: Re: 8.2-PRERELEASE freezing on reboot (-current OK)
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on 14/12/2010 02:38 Jeremy Chadwick said the following:
> 1) 
[snip]
> Also try dropping to the
> debugger via serial console (serial break) or VGA (Ctrl-Alt-Esc).

This is a good advice.

> 2) I'd recommend to those who are experiencing this problem to try
> booting with ACPI disabled (it's one of the boot menu options), and then
> try rebooting the system.  If this works, chances are the issue is
> related to the ACPI code, and someone may want to cross-post to
> freebsd-acpi to get proper attention to it.

This seems to be an outdated advice.
A lot of modern hardware doesn't even boot with ACPI disabled.

-- 
Andriy Gapon