Asus X99-M WS User Guide - Page 107

EHCI Legacy Support [Enabled], xHCI Hand-off [Enabled], EHCI Hand-off [Disabled], USB Single Port

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EHCI Legacy Support [Enabled] [Enabled] Your system supports the USB 2.0 devices in legacy operating systems. [Disabled] Your USB 2.0 devices can be used for BIOS setup only and cannot be recognized in the boot devices list. [Auto] Your system automatically detects the presence of USB 2.0 devices at startup. If any USB 2.0 devices are detected, the xHCI legacy USB support is enabled. xHCI Hand-off [Enabled] [Enabled] Enables the support for operating systems without an xHCI hand‑off feature. [Disabled] Disables the xHCI Hand-off support. EHCI Hand-off [Disabled] [Enabled] Enables the support for operating systems without an EHCI hand‑off feature. [Disabled] Disables the EHCI Hand-off support. USB Single Port Control This item allows you to enable or disable the individual USB ports. Refer to section 1.2.2 Motherboard layout for the location of the USB ports. Chapter 3 ASUS X99-M WS 3-41

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ASUS X99-M WS
3-41
Chapter 3
EHCI Legacy Support [Enabled]
[Enabled]
Your system supports the USB 2.0 devices in legacy operating systems.
[Disabled]
Your USB 2.0 devices can be used for BIOS setup only and cannot be
recognized in the boot devices list.
[Auto]
Your system automatically detects the presence of USB 2.0 devices at
startup. If any USB 2.0 devices are detected, the xHCI legacy USB support
is enabled.
xHCI Hand-off [Enabled]
[Enabled]
Enables the support for operating systems without an xHCI hand-off
feature.
[Disabled]
Disables the xHCI Hand-off support.
EHCI Hand-off [Disabled]
[Enabled]
Enables the support for operating systems without an EHCI hand-off
feature.
[Disabled]
Disables the EHCI Hand-off support.
USB Single Port Control
This item allows you to enable or disable the individual USB ports.
Refer to section
1.2.2 Motherboard layout
for the location of the USB ports.