Acrosser AES-HM76Z1FL - Manual (Page 40)

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5.3.1. SB USB Configuration
Option Choice Description
xHCI Mode
Disabled / Auto /
Smart Auto
Mode of operation of xHCI controller.
EHCI1 ~ 2 Enable / Disable
Control the USB EHCI (USB 2.0) functions. One EHCI
controller must always be enabled.
Legacy USB Support
Enabled / Disabled
/ Auto
Enables Legacy USB support.
AUTO option disables legacy support if no USB devices are
connected.
Disable option will keep USB devices available only for EFI
applications.