Hi there,
I also notice a USB devices count limit xhen using xHCI ports. Only about 35 devices (hubs, HID and USB Key) are detected in windows 8 and 8.1. I was testing in linux too and the limit is 32. May the intel driver in these OS is limitting the count ? However i tested with an Winbows 7, it seems that all devices are detected (until 127) but the driver is not installed as xHCI.
Beside VID/PID are
in Windows 7 : 8086/0F34
in Windows 8 : 8086/0F35
The problem I encounter is that a computer who have only xHCI (USB3) controler and a cascaded integrated USB2 hubs can't have more than about 14 or 15 USB Mass Storage endpoint... What a strange behaviour about USB3 controler management ! I didn't find any information about devices count limit at Intel's. I don't know if the limit is in software or hardware (?!). And all computers I have for now are Intel chipseted...
Thank you