linux-kernel - Re: usb device not showing up

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Date:	Thu, 6 Nov 2008 23:57:13 +0100
From:	Norbert Preining <preining@...ic.at>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Pete Zaitcev <zaitcev@...hat.com>,
	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

Hi Alan,

On Do, 06 Nov 2008, Alan Stern wrote:
> Okay.  In the earlier (working) test, the modem showed up on bus 4, not
> bus 2.  Not that it matters much -- the modem didn't show up at all in

Sorry, it is always bus 4, i meant interface (or how do you call it) 2,
bus id 004:002

> this test, on any bus.  Its USB interface seems to be electrically
> disconnected or turned off.

Right.

> should start working, but I have no idea what that would be.  It's not 
> a USB issue; as far as USB is concerned the device just isn't there at 

Ok, if it is not an usb issue, I guess I have to hope for some fix in
sony-laptop module. 

> Interestingly, this trace appears to be missing some events.  There's a
> gap between timestamps 4284549076 and 4284645743 (the timestamps are in
> the second column) where we should see the initialization of bus 5 and
> bus 6.  Instead there's a 100-ms delay in which nothing happens,
> followed later on by the second initialization phase for those two
> buses.
> 
> I have to wonder...  Did you remove any part of the trace?  Did usbmon 

No. I sent you the output as it was saved on my hard disk. No editing
involved.

> malfunction?  Did parts of the initialization for those two buses 
> really get skipped (I can't imagine how)?

No idea. I can redo any tests you want, but I can guarantee that I
didn't tinker with the usbmon-bad.txt file itself, it was created with
	cat .../0u > usbmon-bad.txt

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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