Asus SABERTOOTH X99 User Guide - Page 113
USB Configuration, Intel xHCI Mode [Smart Auto], xHCI Legacy USB Support [Enabled]
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3.6.5 USB Configuration The items in this menu allow you to change the USB-related features. 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. xHCI Legacy USB Support [Enabled] [Enabled] Your system supports the USB 3.0 devices in legacy operating systems. [Disabled] Your USB 3.0 devices can be used for BIOS setup only and cannot be recognized in the boot devices list. [Auto] Your system automatically detects the presence of USB3.0 devices at startup. If any USB 3.0 devices are detected, the xHCI legacy USB support is enabled. EHCI Legacy USB Support [Enabled] [Enabled] Your system supports the USB 2.0 devices in legacy operating systems. [Disabled] Your USB 2.0 devices can be used for BIOS setup only and cannot be recognized in the boot devices list. [Auto] Your system automatically detects the presence of USB 2.0 devices at startup. If any USB 2.0 devices are detected, the xHCI legacy USB support is enabled. ASUS SABERTOOTH X99 3-43 Chapter 3