linux-kernel - Re: usb device not showing up

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Date:	Thu, 6 Nov 2008 10:23:45 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Norbert Preining <preining@...ic.at>
cc:	Mattia Dongili <malattia@...ux.it>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: usb device not showing up

On Thu, 6 Nov 2008, Norbert Preining wrote:

> Hi Alan,
> 
> On Mi, 05 Nov 2008, Alan Stern wrote:
> > Well, this is a little odd.  The trace shows the modem was detected and
> > enumerated correctly.  But there's nothing corresponding to when you
> > loaded the hso driver.  In fact, there's nothing after uhci-hcd 
> > finished starting up and the unconnected root hubs were suspended.
> 
> Strange. I will redo the thing and see if something changes the second
> time. I am quite sure I loaded hsom but of course without udev running
> (init=/bin/bash) no devices were created.
> 
> > Did you look in /proc/bus/usb/devices at this point?  And what about
> > the files in /sys/bus/usb/drivers/hso/?
> 
> I don't remember, will redo it.
> 
> > This suggests the problem may lie in the hso driver itself, or in a
> > failure to bind the driver to the device.
> 
> Well, the point is that under these circumstances, as I explained,
> *there*is*no*problem*, I can use the device without any problems.

Oh.  Well, you should rerun the test under circumstances in which there 
_is_ a problem.

> Only when I turn of the computer and turn it on again the device simply
> does not show up in the usb system.

Okay, then do the test that way.

Alan Stern

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