Asus P9A-I C2550 4L User Guide - Page 66
Trusted Computing, 4.4.11 USB Configuration, Legacy USB Support [Enabled]
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4.4.10 Trusted Computing Aptio Setup Utility - Copyright (C) 2013 American Megatrends, Inc. Advanced Configuration Security Device Support Current Status Information NO Security Device Found [Disabled] Enables or Disables BIOS support for security device.O.S. will not show Security Device. TCG EFI protocol and INT1A interface will not be available. Security Device Support [Disabled] Allows you to enable or disable BIOS support for security devices. Configuration options: [Disabled] [Enabled] 4.4.11 USB Configuration This allows you to make changes on the configuration settings of the USB. Aptio Setup Utility - Copyright (C) 2013 American Megatrends, Inc. Advanced USB Configuration USB Module Version 8.11.01 USB Devices 3 Drives, 2 Keyboards, 1 Mouse,2 Hubs Legacy USB Support [Enabled] XHCI Hand-off [Enabled] EHCI Hand-off [Disabled] USB Mass Storage Driver Support [Enabled] Port 60/64 Emulation [Enabled] 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. USB hardware delays and time-outs: USB transfer time-out [20 sec] Device reset time-out [20 sec] Device power-up delay [Auto] Mass Storage Devices: AMI Virtual CDROM0 1.00 AMI Virtual Floppy0 1.00 AMI Virtual HDISK0 1.00 [Auto] [Auto] [Auto] The USB Devices item shows the auto-detected values. If no USB device is detected, the item shows None. Legacy USB Support [Enabled] Allows you to enable or disable the support for legacy USB devices. Setting to [Auto] allows the system to detect the presence of USB devices at startup. If detected, the USB controller legacy mode is enabled. If no USB device is detected, the legacy USB support is disabled. Configuration options: [Disabled] [Enabled] [Auto] XHCI Hand-off [Enabled] This functions as a workaround for OSes without XHCI hand-off support. Configuration options: [Disabled] [Enabled] 4-24 Chapter 4: BIOS setup