Asus SABERTOOTH Z97 MARK 2 User Guide - Page 106
USB Configuration, Legacy USB Support [Enabled], Intel xHCI Mode [Smart Auto] - usb 3 1 drivers
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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. Legacy USB Support [Enabled] [Enabled] Your system supports the USB devices in legacy operating systems. [Disabled] Your USB 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 devices at startup. If any USB devices are detected, the legacy USB support is enabled. 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. EHCI Hand-off [Disabled] [Enabled] Enables the support for operating systems without an EHCI hand‑off feature. [Disabled] Disables the EHCI Hand-off support. 3-38 Chapter 3: BIOS setup Chapter 3