[Nottingham] Two rather simple questions

[Martin]

On 23/03/12 13:36, Jason Irwin wrote:
> On 23/03/12 12:24, Jason Irwin wrote:
>> I shall set about fiddling with things.
> This is getting more headache-inducing by the minute.  According to the
> manual for my PC, all USB ports are 2.0.  lsusb disagrees.
> 
> Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 006 Device 002: ID 046d:c521 Logitech, Inc. Cordless Mouse Receiver
> Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 003 Device 002: ID 413c:2005 Dell Computer Corp. RT7D50 Keyboard
> Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 002 Device 002: ID 0644:0200 TEAC Corp. All-In-One Multi-Card Reader
> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> 
> According to some, the receiver simply does not like 1.1 (I can't find
> any external ports that connect to bus 001 or 002).  Although why it
> behaves in the very specific way it does beats the hell out of me.
[---]

That little lot suggests that you have two USB2.0 root hubs. Those hubs
also offer multiple USB1.1 root hubs for the same USB connectors. Hence,
when you plug in a USB2 device, the device sees a USB2 hub. When you
plug in a USB1 device, it gets wired to one of the USB1 root hubs and so
sees USB1. And everyone is happy.

No problem, for that aspect at least...

Cheers,
Martin

-- 
----------------
Martin Lomas
martin at ml1.co.uk
----------------