[lkml]   [2008]   [Dec]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    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

     \ /
      Last update: 2008-12-05 17:07    [W:0.020 / U:5.640 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site