I am experiencing strange things trying to configure USB-Passthrough on ESX 4.1 Update 1.
My goal is to pass through a USB 3.0 interface card (NEC uPD720200) to a virtual host. Platform is Fujitsu Primergy TX200 S6, VMware is ESX 4.1.0 348481
I can see the card I want to pass through. It is marked as supporting passthrough. It is connected to "Intel 5520/550/X58 I/O Hub PCI Express Root Port 3" which is marked as not supporting passthorugh. I can select it, it shows it as configured and asks for a reboot.
After the reboot no devices are configured for passthrough - I can start over without result.
I tried the same with the onboard USBs. Same thing.
The only thing I was able to configure for passthrough through a reboot was one of the Intel I350 NICs, even though it also is connected to a PCI Express Root Port not supporting passthrough.
Am I missing something?