[Gllug] What makes a USB device switch back to 1.1?

[Les Matthew]

On 05/07/2011 18:38, John Winters wrote:
> I hit an interesting problem at the weekend.  A 2 TB Seagate USB drive
> plugged into a nearly new Gigabyte motherboard would only work at 12
> mb/s.  Looking at /var/log/syslog, whichever port it was plugged into a
> message appeared saying it needed to be plugged into a high speed hub in
> order to get anything better.
>
> The same drive plugged into a much older computer works fine at USB 2.0
> speeds.
>
> What might be making the new one run slowly?  I tried both sockets on
> the motherboard, and front-panel ones which are connected to header pins
> on the m/b.  Could it be other USB devices on the same machine (keyboard
> and mouse)?  Faulty wiring?
>
> I've checked the motherboard's BIOS setup screens.  According to the
> documentation for the m/b there should be options to turn USB 2.0 on and
> off, but they simply aren't there in the actual screens.
>
> Anyone any experience of what causes this sort of thing?
>
> Cheers,
> John
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Have you checked the motherboard BIOS MODE setting for the USB 2 
controller is set to Hispeed and not FullSpeed?

Les.

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