I presently have Ubuntu 11.10 32 bit installed on the computer I had the 
issues with. This was an upgrade from 11.04 through the Ubuntu 
repositories. I've had no issues with 11.10 not shutting everything down.

On 11/07/2011 11:39 AM, Alan Stern wrote:
> To everybody who has been affected by this problem:
>
> Attached is a kernel patch which (I hope) will solve the whole matter
> once and for all.  The patch was written for a 3.1 kernel, but it should
> apply with only minimal changes to other recent kernels.  It will affect
> the way the system handles OHCI controllers -- even systems that are
> working okay now.
>
> Since different types of NVIDIA controllers and chipsets behave in
> different ways, I'd like to get as much testing over as wide a range of
> hardware as possible before submitting this for the official kernel.
>
> Please test the patch and let me know if there are any problems with it.
> Two particular things to look out for: Are USB devices powered down
> properly when the system shuts down?  Does the controller continue to
> work after you do "rmmod ohci-hcd ; modprobe ohci-hcd"?
>
> Thanks.
>
> ** Attachment added: "Reset and suspend all idle OHCI controllers; remove 
> NVIDIA shutdown quirk"
>     
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/42149/+attachment/2588553/+files/ohci-idle-suspend
>

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Title:
  USB devices are not powered off at shutdown

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