ASRock Fatal1ty X299 Professional Gaming i9 User Manual - Page 98

USB Configuration, Legacy USB Support, PS/2 Simulator, XHCI Hand-off

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4.6.6 USB Configuration Legacy USB Support Enable or disable Legacy OS Support for USB 2.0 devices. If you encounter USB compatibility issues it is recommended to disable legacy USB support. Select UEFI Setup Only to support USB devices under the UEFI setup and Windows/Linux operating systems only. PS/2 Simulator Enable PS/2 Simulator. This should be enabled for the complete USB keyboard legacy support for non-USB aware OSes. *Enable this option if you install Windows 7. XHCI Hand-off This is a workaround for OSes without XHCI hand-off support. The XHCI ownership change should be claimed by XHCI driver. 90 English

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4.6.6
USB Configuration
Legacy USB Support
Enable or disable Legacy OS Support for USB 2.0 devices. If you encounter USB
compatibility issues it is recommended to disable legacy USB support. Select UEFI
Setup Only to support USB devices under the UEFI setup and Windows/Linux
operating systems only.
PS/2 Simulator
Enable PS/2 Simulator. °is should be enabled for the complete USB keyboard
legacy support for non-USB aware OSes.
*Enable this option if you install Windows 7.
XHCI Hand-off
°is is a workaround for OSes without XHCI hand-off support. °e XHCI
ownership change should be claimed by XHCI driver.