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SubjectRe: USB serial regression 2.6.31.1 -> 2.6.31.2
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On Sat, 2009-10-10 at 16:41 -0400, Alan Stern wrote:
> On Sat, 10 Oct 2009, Alan Stern wrote:
>
> > On Sat, 10 Oct 2009, Josua Dietze wrote:
> ...
> > > This is one of the mode switching devices. It is switched to modem
> > > mode by "usb_stor_huawei_e220_init".
> > >
> > > Something keeps resetting it to initial mode. It might be a
> > > powersave/suspend issue.
> >
> > It's not related to powersave or suspend. (Although both trace files
> > show that the device's remote-wakeup feature did get enabled; I have no
> > idea what code was responsible for doing that. AFAIK it shouldn't
> > happen unless the device is about to be suspended.)
>
> It turns out that the remote-wakeup enable _is_ the mode-switch
> command. Don't ask me why the manufacturer decided to use an
> pre-existing command to tell the device to switch modes.
>
> Anyway, it's clear from the logs that the mode switch worked in both
> cases. Initially the device shows only one interface, and after the
> mode switch it shows four.

Yes, that works, you can see the ttyUSBx ports showing up. It looks like
it may just be the resets coming from usb-storage that are breaking
things.

Cheers,
Ben.




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