User Manual
Page 68
XHCI Hand-off support. The XHCI ownership change should be claimed by XHCI driver. 62 English If you encounter USB compatibility issues it is a workaround for USB 2.0 devices. Select UEFI Setup Only to disable legacy USB support. 4.6.6 USB Configuration Legacy USB Support Enable or disable Legacy OS Support for OSes without XHCI hand-off This is recommended to support USB devices under the UEFI setup and Windows/Linux operating systems only.
XHCI Hand-off support. The XHCI ownership change should be claimed by XHCI driver. 62 English If you encounter USB compatibility issues it is a workaround for USB 2.0 devices. Select UEFI Setup Only to disable legacy USB support. 4.6.6 USB Configuration Legacy USB Support Enable or disable Legacy OS Support for OSes without XHCI hand-off This is recommended to support USB devices under the UEFI setup and Windows/Linux operating systems only.