do you have a nvidia usb controller?
and had/have problems with usb devices staying powered on after shutdown?
this patch added in 2.6.37 had the opposite effect on my system: https://patchwork.kernel.org/patch/341321/
but the helpful devs found a solution: http://marc.info/?l=linux-usb&m=130142049527638&w=2
so in my system all is fine again.
but, as i didn't find anyone with this problem (the first patch having the opposite effect) anywhere, i wanted to ask you if you can test this patch and tell if your nvidia usb controller still (or now) works as supposed.
if desired, i can also tell when (if) this patch gets included upstream. (so you don't need to hassle with this patch, but know when to check)