linux-kernel - Re: usb device not showing up

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Message-ID: <20081104161708.GA32570@gamma.logic.tuwien.ac.at>
Date:	Tue, 4 Nov 2008 17:17:08 +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 Di, 04 Nov 2008, Alan Stern wrote:
> > - 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?

I meant: 
- first booting vista, then re-booting ... the device shows up (and is
  functional)

- booting from off state the device does not show up and cannot be
  switched on using /sys/devices/platform/sony-laptop/wwanpower
  (although the behaviour that it can be switched on using the above
  sysfs file is documented)

> 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.

Ok, I will recompile my kernel with USB as modules and do the above. Is
there a way to tell the kernel not to load any device drivers/modules
(probably overriding modprobe in some way)?

Best wishes

Norbert

-------------------------------------------------------------------------------
Dr. Norbert Preining <preining@...ic.at>        Vienna University of Technology
Debian Developer <preining@...ian.org>                         Debian TeX Group
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