Asus P5M2 - ACPI Configuration

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Chapter 4: BIOS setup
4.4.7 ACPI Configuration
The ACPI Conguration menu items allow you to change the settings for the ACPI
features. Select an item then press <Enter> to display the conguration options.
AC PI 2.0 Su ppo rt [Yes]
Allows you to add additional tables as per Advanced Conguration and Power
Interface (ACPI) 2.0 specications. Conguration options: [No] [Yes]
He adl ess Mo de [Di sab led ]
Allows you to enable or disable the Headless operation mode through ACPI.
[Disabled] [Enabled]
AC PI EMS Su ppo rt [Di sab led ]
Allows you to enable or disable ACPI EMS support. [Disabled] [Enabled]
AC PI MCF G S upp ort [E nab led ]
Allows you to enable or disable ACPI MCFG support. [Disabled] [Enabled]
Select Screen
Select Item
+- Change Option
F1 General Help
F10SaveandExit
ESCExit
ACPIConguration 
ACPI2.0Support  [Yes]
HeadlessMode  [Disabled]
ACPIEMSSupport  [Disabled]
ACPIMCFGSupport  [Enabled]