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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org
Date: Sat, 2 Jan 2010 21:43:35 +0100
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Cc: freebsd-bugs@freebsd.org, linimon@freebsd.org
Subject: Re: usb/142229: [ums] [hang] connecting a USB mouse to a Dell PE750
	locks up kernel
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On Saturday 02 January 2010 18:26:04 linimon@freebsd.org wrote:
> Old Synopsis: connecting a USB mouse to a Dell PE750 locks up kernel
> New Synopsis: [ums] [hang] connecting a USB mouse to a Dell PE750 locks up
> kernel
>
> Responsible-Changed-From-To: freebsd-bugs->freebsd-usb
> Responsible-Changed-By: linimon
> Responsible-Changed-When: Sat Jan 2 17:25:40 UTC 2010
> Responsible-Changed-Why:
> Over to maintainer(s).

Hi,

Can you enable USB debugging before plugging the mouse:

sysctl hw.usb.debug=15
sysctl hw.usb.ums.debug=15

Have you tried to disable legacy USB support in the BIOS?

You can also try to press CTRL+ALT+ESC and if the KDB prompt appears, enter 
"bt".

Does the kernel also hang when the mouse module (device ums, ums.ko) is not 
compiled into the kernel?

--HPS