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ASUS X99-A
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Chapter 3
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.