User Manual
Page 69
This should be enabled for the complete USB keyboard legacy support for USB 2.0 devices. 4.4.6 USB Configuration Legacy USB Support Enable or disable Legacy OS Support for non-USB aware OS. *Enable this option if you encounter USB compatibility issues it is recommended to support USB devices under the UEFI setup and Windows/Linux operating systems only. Port 60/64 Emulation Enable the support of I/O port 60h/64h emulation. If you install Windows 7. 64 English Select UEFI Setup Only to disable legacy USB support.
This should be enabled for the complete USB keyboard legacy support for USB 2.0 devices. 4.4.6 USB Configuration Legacy USB Support Enable or disable Legacy OS Support for non-USB aware OS. *Enable this option if you encounter USB compatibility issues it is recommended to support USB devices under the UEFI setup and Windows/Linux operating systems only. Port 60/64 Emulation Enable the support of I/O port 60h/64h emulation. If you install Windows 7. 64 English Select UEFI Setup Only to disable legacy USB support.