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Date: Thu, 23 May 2013 09:44:11 +0200
From: Hans Petter Selasky <hps@bitfrost.no>
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Subject: Re: Force USB2 controller to use USB1 for virtualbox usage
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Hi again,

Have you loaded the xhci driver? If your device attaches to the XHCI 
driver then it cannot be switched to FULL speed only.

Also look for other USB devices which have "none" as driver.

>>
>> none2@pci0:13:0:0:      class=0x0c0330 card=0x21d217aa chip=0x01941033
>> rev=0x04 hdr=0x00
>>      vendor     = 'NEC Corporation'
>>      device     = 'uPD720200 USB 3.0 Host Controller'
>>      class      = serial bus
>>      subclass   = USB
>
>>> From /var/log/messages:

--HPS