USB\ROOT_HUB\ Waking computer.

Hi,
this is not a solution (nor an answer directly related) to your topic, and I am sorry for resuming this old thread.

But since I've run into it as the first result on Google while trying to find a solution to my problem, I'd like any people who will eventually read it, to try other possible procedures too.

So, Usb Root Hub.
I experienced random awakenings from S3 sleep state too.

With device management, I prevented everything, mouse, keyboard, all nics, from reactivating the pc from its sleep state.

I upgraded the BIOS and altered some of its settings (e.g. ehci hand-off), installed more recent chipset drivers and even changed to disabled the USB selective suspend setting in advanced power settings.

But still no changes.

Via

Code:

powercfg /lastwake

I found out that one of my usb root hubs was the cause of the last wake;
but it seemed to me, that hub, that it was the root hub connected to the usb mouse port (suspicion proved by evidence when I moved the mouse on purpose during sleep, and the pc woke up).

Then I suddenly remembered I am behind a KVM switch.
I don't know exactly what class my KVM switch belongs to (see KVM switch - Wikipedia, the free encyclopedia), anyway there was an option (via keyboard sequence) to deactivate mouse emulation.

A new HID mice was installed, and now, after having unticked the option in device management for preventing it from waking the computer, everything works OK.

Hurray! :)

In short,
pay ATTENTION if you are behind a KVM switch:
you may have to disable (if allowed) any available mouse emulation feature before things really work.