Asus M2N-LR/SATA - Manual (Page 81)

-2 Chapter : BIOS setup
The Module Version and USB Devices Enabled items show the
auto-detected values. If no USB device is detected, the USB Devices Enabled
item shows None.
USB 1.1 Controller [Enabled]
Enables or disables the USB 1.1 Controller.
Configuration options: [Disabled] [Enabled]
USB 2.0 Controller [Enabled]
Enables or disables the USB 2.0 Controller.
Configuration options: [Disabled] [Enabled]
Legacy USB Support [Enabled]
Allows you to enable or disable support for legacy USB devices. Setting to [Auto]
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.
Configuration options: [Disabled] [Enabled] [Auto]
USB 2.0 Controller Mode [HiSpeed]
Allows you to set the USB 2.0 controller mode to HiSpeed (480 Mbps) or
FullSpeed (12 Mbps). Configuration options: [HiSpeed ] [FullSpeed ]
BIOS EHCI Hand-Off [Enabled]
Enables or disables the BIOS EHCI hand-off feature.
Configuration options: [Enabled] [Disabled]