linux-kernel - Re: usb device not showing up

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Message-ID: <Pine.LNX.4.44L0.0811041015010.2642-100000@iolanthe.rowland.org>
Date:	Tue, 4 Nov 2008 10:23:46 -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 Tue, 4 Nov 2008, Norbert Preining wrote:

> Hi Alan,
> 
> On Mo, 03 Nov 2008, Alan Stern wrote:
> > What happens if you leave the modem turned off until after Linux is 
> > running?  If it does not show up then a usbmon trace would be helpful 
> > (see Documentation/usb/usbmon.txt for instructions).
> 
> I can run usbmon, but I am not sure what you mean with "leave the modem
> turned off until after Linux is running".

I must have misunderstood your earlier message, where you wrote:

> Interestingly this device does disappear if I cold boot into linux.
> 
> So:
> - First booting Vista, then RE-booting (not turning it off in the
>   meantime) into linux gives me that device and everything works.

By "it", did you mean the laptop or the modem?

> If I start from turned off state of the laptop and boot into linux the
> device is not showing up. Is it that state you are interested in getting
> the usbmon output?

No.  I'm interested in seeing the usbmon output for when the modem is
first detected by the USB subsystem.  During a normal boot this will 
happen before you can start usbmon.

If you can't boot with the modem off, then try this instead: Unload 
ehci-hcd, uhci-hcd, and ohci-hcd, then start up usbmon (copy the 0u 
file) and reload whichever driver the modem attaches to.

Alan Stern

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