For whatever it's worth, my laptop has an ASUS UL20A motherboard with an 82801I (ICH9) Intel chipset. It's got EHCI and UHCI, and it does not suffer from the "immediate wakeup" bug on the UHCI controllers.
(On the other hand, UHCI wakeup doesn't seem to work at present... but that's a different story.)
For whatever it's worth, my laptop has an ASUS UL20A motherboard with an 82801I (ICH9) Intel chipset. It's got EHCI and UHCI, and it does not suffer from the "immediate wakeup" bug on the UHCI controllers.
(On the other hand, UHCI wakeup doesn't seem to work at present... but that's a different story.)