There are two possible causes for this problem: in the BIOS setup, the USB 3.0 port(s) are downgraded to USB 2.0 within Windows 7, the Intel( R) USB 3.0 Host Controller Switch Driver is not installed The BIOS option: Only some motherboards offer an option to disable USB 3.0 in the BIOS setup; don't expect to find it everywhere. The Windows driver option: Another thing you should check is whether you have the Intel( R) USB 3.0 Host Controller Switch Driver installed. To check whether it is installed, open the Device Manager, open the View menu and select Devices by Connection, then verify it as follows: If iusb3hcs does not appear when you select Device lower filters in the details of the PCI bus device, you do not have this essential driver installed. To install it, you should reinstall Intel's drivers (for your hardware - either C216 or C220 since they install the Intel( R) USB 3.0 Host Controller Switch Driver (iusb3hcs). Technical details Technically, the iusb3hcs driver is installed as a device lower filter of the PCI bus device. The filter driver's goal is to initialize the Intel-specific XUSB2 PR register during PCI bus startup. This register allows per-port configuration, to either direct it to the XHCI ( USB 3.0) or EHCI ( USB 2.0) controller. ( Fun fact: The equivalent Linux code can be found here.) If the filter driver is not installed, the default configuration will apply: all ports would be directed to USB 2.0.
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If you are like me, you’ve got a plethora of USB devices connected to your computer at any given time. With USB hubs and universal docking stations being so common today, it’s easy to be able to connect dozens of USB devices without ever needing to unplug anything. That is, until you get the dreaded “ Not enough USB controller resources – The controller does not have enough resources for this device.” error message down by the Windows system tray icons. At that moment you’re likely saying to yourself, “ How can this be? My state-of-the-art system can’t handle just one more USB device?” Unfortunately, in the upgrade from USB 2.0 to USB 3.0, there are some trade-offs in terms of fewer devices that can be connected at once. And those limits apply not just to USB 3.0 devices, but to all devices connected to a USB 3.0 host. Here’s what we think we know. The most commonly affected users are trying to expand device connectivity to systems like the Microsoft Surface Pro where only a single USB 3.0 port is present. Normally one can just connect a hub or two and not worry but with the Surface tablets, the majority of the internal devices such as Wi Fi/ Bluetooth, audio, front & rear cameras, touch HID, pen HID, and SD card reader are all tied off of the Intel USB 3.0 XHCI host controller using up a ton of the limited USB resources (endpoints) available not leaving hardly anything left for the hub and subsequent attached devices. Where it really starts to get complicated is knowing that these resources (endpoints) are not exactly tied to how many individual USB devices there are but rather the number of endpoints each USB device has. This number van vary per device, but the maximum is 32 endpoints with 16 in and 16 out. Assuming you had some devices that actually used all 32 of their possible endpoints, resources are going to run out quickly. There has been some discussion in the Intel.
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