linux-kernel - Re: [linux-usb-devel] possible USB regression with 2.6.21-rc4: iPod doesn't work

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Message-ID: <Pine.LNX.4.44L0.0703261617110.4848-100000@iolanthe.rowland.org>
Date:	Mon, 26 Mar 2007 16:28:34 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Tino Keitel <tino.keitel@....de>
cc:	Oliver Neukum <oneukum@...e.de>,
	<linux-usb-devel@...ts.sourceforge.net>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] possible USB regression with 2.6.21-rc4: iPod
 doesn't work

On Mon, 26 Mar 2007, Tino Keitel wrote:

> Attached is a dmesg output with CONFIG_USB_DEBUG and CONFIG_USB_SUSPEND
> enabled.
> 
> There are no messages from the iPod because, well, nothing happens when
> I plug it in. I tried it 3 times.

I don't understand.  The dmesg log you attached shows the iPod was
detected and recognized as scsi5 (sdc).  Then some time later (can't tell
how much later because you don't have CONFIG_PRINTK_TIME set) it was
unplugged and plugged back in.  The second time it was detected and
recognized as scsi6 (also sdc).  And then the log ends.

Why do you say there are no messages from the iPod?  Grepping for "iPod"
in the log shows that the string appears 4 times.  If nothing happened
when you plugged it in, how could the computer have known the device was
an iPod?

>  The strange thing is: when I trigger
> a suspend or shutdown, 

You mean you suspend or shutdown the computer?  Or the iPod?

>  then the "Do not disconnect" message shows up on
> the iPod, which means that the computer regognized it as a storage
> device.

What's so strange about that?  Isn't that exactly what's supposed to 
happen?

Alan Stern

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