User Manual
Page 63
Select UEFI Setup Only to disable legacy USB support. If you encounter USB compatibility issues it is recommended to support USB devices under the UEFI setup and Windows/Linux operating systems only. 59 English 4.3.7 USB Configuration Q1900TM-ITX USB 3.0 Controller Enable or disable all the USB 3.0 ports. Legacy USB Support Enable or disable Legacy OS Support for USB 2.0 devices.
Select UEFI Setup Only to disable legacy USB support. If you encounter USB compatibility issues it is recommended to support USB devices under the UEFI setup and Windows/Linux operating systems only. 59 English 4.3.7 USB Configuration Q1900TM-ITX USB 3.0 Controller Enable or disable all the USB 3.0 ports. Legacy USB Support Enable or disable Legacy OS Support for USB 2.0 devices.