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List:       linux-usb-users
Subject:    Re: [Linux-usb-users] Spontaneous USB subsystem shutdown
From:       Alan Stern <stern () rowland ! harvard ! edu>
Date:       2007-05-29 13:52:45
Message-ID: Pine.LNX.4.44L0.0705290951470.3283-100000 () iolanthe ! rowland ! org
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On Tue, 29 May 2007, Juergen Botz wrote:

> On Mon, 2007-05-28 at 22:17 -0400, Alan Stern wrote:
> > This log doesn't show an orderly disconnect of all USB devices -- only
> > the devices below 4-2 (a hub).
> 
> Well that's because at this time I have everything plugged 
> into one hub.  The reason is just that it keeps my cableing
> cleaner.  But since I've been having these problems  I've 
> tried variations with and without that hub, with another
> hub, etc., always with same results.
> 
> What I need is some way of getting more information... how
> can I enable some debugging output from the usb subsystem?

1. Turn on CONFIG_USB_DEBUG and rebuild.

2. Use usbmon (see Documentation/usb/usbmon.txt).

Alan Stern


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