5.3.1. SB USB Configuration
Disabled / Auto /
Smart Auto
Mode of operation of xHCI controller.
Control the USB EHCI (USB 2.0) functions. One EHCI
controller must always be enabled.
Enabled / Disabled
/ Auto
Enables Legacy USB support.
AUTO option disables legacy support if no USB devices are
connected.
Disable option will keep USB devices available only for EFI
applications.
