On Fri, 3 Oct 2008, Alan Stern wrote:

quoted text
> You should use usbmon (see Documentation/usb/usbmon.txt) to record a 
> trace of everything happening on bus 3.  And to keep things simple, you 
> should unplug all the USB devices except for one of the magical 
> disappearing hubs.

Better still, get two traces: one from each kernel.  Then they can be 
compared.

Alan Stern

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