I have been analyzing the problem using a 2.6.24 kernel and I found
where the problem is.
As I thought, devices->USB support->USB selective suspend/resume and
wakeup (USB_SUSPEND) is needed.
Besides, for later kernels, /sys/bus/usb/devices/<n-n>/power/level is
initialized with "on" instead of "auto".
Doing 'echo auto > /sys/bus/usb/devices/<n-n>/power/level' fixes the problem.
I don't know the reason for this to have changed however.
May be upstream has something to say about this.
** Changed in: linux (Ubuntu)
Status: Incomplete => In Progress
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bug or feature request - kernel: Removing modules do not turn off devices
https://bugs.launchpad.net/bugs/150783
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