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Chapter 2: BIOS information 2-19

2.5.3 USB Conguration

The items in this menu allow you to change the USB-related features.

The USB Devices item shows the auto-detected values. If no USB device is detected, the

item shows None.

USB Device Enable [Enabled]

[Enabled] Enables available USB devices.

[Disabled] Disables available USB devices.

Legacy USB Support [Enabled]

[Enabled] Enables the support for USB devices on legacy operating systems (OS).

[Disabled] The USB devices can be used only for the BIOS setup program.

[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.

Legacy USB3.0 Support [Enabled] (A55M-A/USB3 only)

[Enabled] Enables the support for USB 3.0 devices on legacy operating systems

(OS).

[Disabled] Disables the function.

EHCI Hand-off [Disabled]

[Enabled] Enables the support for operating systems without an EHCI hand-off

feature.

[Disabled] Disables the function.

USB Single Port Control

Allows you to enable/disable individual USB ports.

2.5.4 NB Conguration

IGFX Multi-Monitor [Disabled]

Enables or disables the Internal Graphics Device Multi-Monitor support for add-on VGA

devices. And the memory size of Internal Graphics Device will keep memory reserved.

Conguration options: [Disabled] [Enabled]

Primary Video Device [PCIE / PCI Video]

Selects the primary display device. Conguration options: [IGFX Video] [PCIE / PCI Video]

Integrated Graphics [Auto]

Enables the integrated graphics controller. Conguration options: [Auto] [Force]

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Asus A55M-A Spezifikationen Seite 61