From owner-freebsd-acpi@FreeBSD.ORG  Wed Dec 19 00:51:59 2012
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Date: Tue, 18 Dec 2012 16:51:45 -0800
From: matt <sendtomatt@gmail.com>
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To: Master One <MasterOne@o0l0o.org>
Subject: Re: Acer Aspire One 753 Netbook: ACPI or Sandy Bridge Problem
References: <c38f9ede06352dc3baa756ffa4436ce9@buymore.at>
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On 12/18/12 09:53, Master One wrote:
>
> - CPU fan goes to maximum after booting
> - "shutdown -p now" completes the shutdown process, turns off the
> screen, but does not turn off the computer
> - "reboot" completes the shutdown process, but gets stuck at the line
> "usbus1: Controller shutdown complete" for about 30 seconds before it
> finally reboots
> - "zzz" does some USB related disconnecting and then just hangs
>

This sounds like a misbehaving USB device. Disable all peripherals in
the BIOS if possible (webcam, fingerprint if present, whatever other junk)

And unplug this:
uhub3: <vendor 0x8087 product 0x0020, class 9/0, rev 2.00/0.00, addr 2>
on usbus1
uhub3: 8 ports with 8 removable, self powered
ugen1.3: <Sonix Technology Co., Ltd.> at usbus1

Then give it another try. I don't see anything that screams ACPI problem
so much as a device that times out a lot, leaving the kernel waiting.
Just a guess though.

Matt