Toshiba DynaDock vs Toshiba P875 (Intel USB)

[FloridaMatt]

Toshiba Dynadock U3.0 model PA3927U-1PRP, 7.4M0 drivers. Installs and works fine on a Win7 x86 desktop (usb2).

Toshiba P875-A7102 laptop, Intel 7 series C216 chipset, Intel USB 3.0 eXtensible host controller - 0100 (Microsoft). Windows 8 x64

After considerable effort, it's working but with problems. usb ports, network, video all operate as expected. But...

(1) if the dynadock is plugged in, and the laptop goes to sleep it immediately reawakens, and begins a cycle of going to sleep and reawakening every few seconds.

(2) Device Manager has a yellow-triangled Unknown USB Device (Link in Compliance Mode). When viewing by connection, it's directly under the xHCI (usb3) root hub.

(3) I keep getting messages about the last usb device connected has malfunctioned. I get these even if I disconnect the dynadock and reboot. Disabling or uninstalling the unknown device does not get rid of them either.

In googling about there seems to be a possibility that the Microsoft drivers for this particular intel chip aren't the same as ones from intel, but the intel website does not admit to there being any non-microsoft win8 drivers.

I've tried various combinations of changing USB selective suspend and allowing/disallowing the computer to turn off the xHCI (usb3) root hub. I've also tried using a usb2 cable instead of the one that came with the dynadock.

I'd appreciate suggestions for how to proceed from here.