Asus P9X79 LE User Manual page 100

The USB Devices item shows the auto-detected values. If no USB device is detected, the
item shows None.
Legacy USB Support [Enabled]
[Disabled]
[Enabled]
[Auto]
Legacy USB3.0 Support [Enabled]
[Disabled]
[Enabled]
EHCI Hand-off [Disabled]
[Disabled]
[Enabled]
SB USB Configuration
All USB Devices [Enabled]
Allows you to enable or disable all USB devices.
Configuration options: [Disabled][Enabled]
EHCI Controller 1 [Enabled]
Allows you to enable or disable EHCI Controller 1.
Configuration options: [Disabled][Enabled]
EHCI Controller 2 [Enabled]
Allows you to enable or disable EHCI Controller 2.
Configuration options: [Disabled][Enabled]
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The USB devices can be used only for the BIOS setup program.
Enables the support for USB devices on legacy operating systems (OS).
Allows the system to detect the presence of USB devices at startup. If
detected, the USB controller legacy mode is enabled. If no USB device is
detected, the legacy USB support is disabled.
Disables the function.
Enables the support for USB 3.0 devices on legacy operating systems
(OS).
Disables the function.
Enables the support for operating systems without an EHCI hand-off
feature.
Chapter 3: BIOS setup