Can you try without USB?Not really. The keyboard is USB, and there's no PS/2 connector. I guess I maybe could do it via a timer, unload the modules and then have it shut down afterwards...
With USB but without experimentalI don't have USB_SUSPEND enabled, IIRC (don't have the PB with me, but I'm pretty sure I checked this yesterday. If you don't hear back, assume it wasn't enabled)
CONFIG_USB_SUSPEND?