From owner-freebsd-usb@FreeBSD.ORG  Wed Mar 27 20:05:46 2013
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Date: Wed, 27 Mar 2013 21:07:07 +0100
From: Hans Petter Selasky <hps@bitfrost.no>
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To: kermus <kermus@gmail.com>
Subject: Re: Unknown USB device: vendor 0x051d product 0x0002 bus uhub0
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On 03/27/13 20:46, kermus wrote:
> hi!
>
> i'm struggling exact same type problem with Nas4Free(freeBSD Nas) and APC
> Smart-UPS
>
> is there any workaround or fix for this message flood

Hi there!

/usr/src/etc/devd.conf: action "logger Unknown USB device: vendor ...

You probably can get rid of those messages by editing /etc/devd.conf and 
comment out this:

# Various logging of unknown devices.
nomatch 10 {
         match "bus" "uhub[0-9]+";
         action "logger Unknown USB device: vendor $vendor product 
$product \
                 bus $bus";
};

Then restart devd or reboot.

--HPS