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SubjectRe: pl2303 - pl2303_open - failed submitting interrupt urb, error -28
On Fri, 5 Dec 2008, Marc Haber wrote:

> On Wed, Dec 03, 2008 at 07:47:25AM -0800, Greg KH wrote:
> > I would suggest using a USB 1.1 hub instead if you have to use this kind
> > of hardware set up.
> It is nearly impossible to buy that kind of hardware at the current
> time.
> > I think the core is just not able to schedule so many interrupt urbs
> > with such a setup, running USB 1.1 devices behind a USB 2.0 hub like
> > this is a very difficult thing to do.
> >
> > Sorry I don't have a better solution.
> Is it possible to disable USB 2.0 for selected links?

Yes it is. You can force port P of the EHCI controller on bus B to run
at low/full speed by doing:

echo P >/sys/class/usb_host/usb_hostB/companion

To allow port P to run at high speed again, use the same command but
write -P instead of P.

Alan Stern

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