From owner-freebsd-usb@FreeBSD.ORG  Fri Sep  3 07:16:54 2010
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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Fri, 3 Sep 2010 09:12:45 +0200
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Subject: Re: device attach problem on boot
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On Friday 03 September 2010 08:12:56 Piotr Isajew wrote:
> Hello,
> 
> I'm considering to move one of my projects from Linux to FreeBSD. The
> project uses lots of USB modems. To test if my hardware is supported
> by FreeBSD I installed 8.1-STABLE. During first test I noticed that no
> modems are detected by OS during startup (i.e. "usbconfig list"
> doesn't show any of those devices). However if I remove a modem from
> USB port once the system is running and then plug it in again, it's
> properly detected and works without problems.
> 
> The only dmesg lines that looks suspicious to me are:
> 
> usb_alloc_device: getting device descriptor at addr 3 failed,
> USB_ERR_STALLED usbd_req_re_enumerate: getting device descriptor at addr 3
> failed, USB_ERR_STALLED
> 
> I'll apreciate any help on solving this problem.
> 
> Kind regards,
> 
> Piotr

Have you tried using an external powered USB HUB?

Do these modems have autoinstall disks?

--HPS