Asus X99-A USB 3.1 User Guide - Page 115
USB Configuration, Intel VT for Directed I/O VT-d, Intel xHCI Mode [Smart Auto]
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Intel VT for Directed I/O (VT-d) The items in this menu allow you to configure the Intel® Virtualization Technology for Directed I/O (VT-d). Intel VT for Directed I/O (VT-d) [Disabled] This item allows you to enable/disable the Intel Virtualization Technology for Directed I/O (VT-d) by reporting the I/O device assigment to VMM through DMAR ACPI Tables. Configuration options: [Enabled] [Disabled] 3.6.5 USB Configuration The items in this menu allow you to change the USB-related features. Chapter 3 The Mass Storage Devices item shows the auto-detected values. If no USB device is detected, the item shows None. Intel xHCI Mode [Smart Auto] [Auto] The xHCI is automatically enabled and runs at USB 3.0 mode when the xHCI driver is installed in the operating system. [Smart Auto] Upon detection, the xHCI driver supports the USB 3.0 mode during both POST and operating system. [Enabled] Enables the xHCI controller. [Disabled] Disables the xHCI controller. ASUS X99-A/USB 3.1 3-39