ASRock Z790 Pro RS Software/BIOS Setup Guide - Page 77
USB Configuration, Legacy USB Support, XHCI Hand-off
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3.4.7 USB Configuration Intel Z790/H770/B760 Series Legacy USB Support Allows you to enable or disable Legacy OS Support for USB devices. This item appears only for the motherboard that supports the PS/2 port. [Auto] disables legacy support if no USB devices are connected. [Disabled] keeps USB devices available only for EFI applications. [UEFI Setup Only] sets to support USB devices under the UEFI setup and Windows/Linux operating systems only. XHCI Hand-off This is a workaround for OSes without XHCI hand-off support. The XHCI ownership change should be claimed by XHCI driver. Configuration options: [Enabled] [Disabled] 73
73
Intel Z790/H770/B760 Series
3.4.7
USB Configuration
Legacy USB Support
Allows you to enable or disable Legacy OS Support for USB devices. °is item appears only
for the motherboard that supports the PS/2 port.
[Auto] disables legacy support if no USB devices are connected.
[Disabled] keeps USB devices available only for EFI applications.
[UEFI Setup Only] sets to support USB devices under the UEFI setup and Windows/Linux
operating systems only.
XHCI Hand-off
°is is a workaround for OSes without XHCI hand-off support. °e XHCI ownership
change should be claimed by XHCI driver.
Configuration options: [Enabled] [Disabled]