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Date: Fri, 08 Jun 2012 22:56:15 +0200
From: Erik Rull <erik.rull@rdsoftware.de>
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Subject: Re: [Qemu-devel] USB Hostport Differences
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To: Hans de Goede <hdegoede@redhat.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Gerd Hoffmann <kraxel@redhat.com>

Hans de Goede wrote:
> Hi,
>
> On 06/08/2012 06:33 PM, Erik Rull wrote:
>> Hi all,
>>
>> when assigning USB host devices to a guest using the hostport option,
>> there seem to be different formats, when calling info usbhost:
>>
>> - On my vanilla kernel linux there is a hostport format e.g. "1.5" or "1.2"
>> - On my Debian 6.0 full blown linux there is a hostport format "2" or
>> "4", that means, there are no dots and only one number
>>
>
> Hmm, is this on the same machine, with the usb devices hooked up the same
> way? Normally these differences come
> from there being hubs in the chain, ie "2" or "4" indicate devices plugged
> directly into a root hub,
> "1.5" and "1.2" mean devices plugged into a hub, which itself is plugged
> into root port "1"
>
> Regards,
>
> Hans

No it's on different machines - first with Intel Hardware, second with AMD 
Hardware. I have no hubs attached, I use the ports that are offered 
directly on the mainboard (EPIC Nano Connectors / ATX rear side panel). On 
all other Intel systems I see the same effect with the "1.x" ports. Only 
the AMD system shows the single numbers.

Maybe the root hubs are different on Intel and AMD hardware?

Best regards,

Erik