LKML Archive on
help / color / mirror / Atom feed
From: Alan Stern <>
To: Norbert Preining <>
Cc: Mattia Dongili <>,
	Kernel development list <>,
	USB list <>
Subject: Re: usb device not showing up
Date: Tue, 4 Nov 2008 10:23:46 -0500 (EST)	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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

  reply	other threads:[~2008-11-04 15:24 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-03 15:31 Norbert Preining
2008-11-03 19:05 ` Alan Stern
2008-11-04  9:37   ` Norbert Preining
2008-11-04 15:23     ` Alan Stern [this message]
2008-11-04 16:17       ` Norbert Preining
2008-11-04 16:36         ` Alan Stern
2008-11-04 21:58           ` Norbert Preining
2008-11-05 16:13             ` Alan Stern
2008-11-06 15:00               ` Norbert Preining
2008-11-06 15:23                 ` Alan Stern
2008-11-06 17:19                   ` Norbert Preining
2008-11-06 19:34                     ` Alan Stern
2008-11-06 22:57                       ` Norbert Preining
2008-11-07  3:26                         ` Alan Stern
2008-11-07  1:54                       ` Pete Zaitcev

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \
    --subject='Re: usb device not showing up' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).