linux-kernel - Re: usb device not showing up

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Date:	Thu, 6 Nov 2008 18:19:58 +0100
From:	Norbert Preining <preining@...ic.at>
To:	Alan Stern <stern@...land.harvard.edu>
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 Do, 06 Nov 2008, Alan Stern wrote:
> > 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.

Here it is. Sequence of events:
- turn off the laptop, physically
- turn it on
- boot in to linux with modular usb and init=/bin/bash
- mount /proc, /sys, /sys/kernel/debug
- modprobe usbmon (file /sys/kernel/debug/usbmon/{0s,0u} are present)
- start some getty to have more terminals, mount / rw

- cat /sys/kernel/debug/usbmon/0u > usbmon-bad.txt
- modprobe uhci-hcd
- modprobe hso

The device does not show up in /proc/bus/usb/devices (mounted before
probing and debugging), only bus 4 hub is there.

/sys/bus/usb/drivers/hso/ shows
	bind  module  new_id  uevent  unbind

- sync
- cat process

Outcome is the attached usbmon-bad.txt

This is the one where the device does not show up.

Best wishes

Norbert

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Dr. Norbert Preining <preining@...ic.at>        Vienna University of Technology
Debian Developer <preining@...ian.org>                         Debian TeX Group
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View attachment "usbmon-bad.txt" of type "text/plain" (16406 bytes)