USB subsystem stops working

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Hi everyone,
(please Cc)

I am currently running 3.8.0-rc4 and see the following behaviour:
When I plug/eject my kindle a few times, suddenly the kernel does
not see any USB activity any more. Nothing. PLugging in the kindle -
no reaction, plugging in a usb kbd - no reaction, plugging in a 
usb  mouse - no reaction. All dead.

I turned on udev debug mode, no messages at all.

I restarted udev - no changes.

Unfortunately I have build the kernel with USB fix built in,
so I cannot unload the module.

While everything connected, a simple
	lsusb
didn't show up any devices but what was there from the beginning.

Bu then, I did a 
	lsusb -v
and whoops everything was back there ...

Is there a different way to achieve this?
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 007: ID 05ac:1006 Apple, Inc. Hub in Aluminum Keyboard
Bus 002 Device 003: ID 17ef:4815 Lenovo Integrated Webcam [R5U877]
Bus 001 Device 010: ID 1949:0004 Lab126 Amazon Kindle 3/4
Bus 001 Device 008: ID 05ac:0220 Apple, Inc. Aluminum Keyboard (ANSI)
Bus 001 Device 009: ID 05ac:0304 Apple, Inc. Optical USB Mouse [Mitsumi]

(now everything is connected via the kbd which serves as a hub, but
it was the same during direct connection of the kindle to the laptop).

Lenovo ThinkPad Edge.

Thanks a lot and all the best
(please Cc)

Norbert

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