6 acpi configuration, Advanced acpi configuration, Acpi 2.0 support [enabled – Asus P7F-X SATA User Manual
Page 82: Acpi apic support [enabled, Headless mode [disabled

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Chapter 4: BIOS setup
4.4.6
ACPI Configuration
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
BIOS SETUP UTILITY
Advanced
ACPI Settings
Advanced ACPI Configuration
Chipset ACPI Configuration
General WHEA Configuration
←→
Select Screen
↑↓
Select Item
+- Change Option
F1 General Help
F10 Save and Exit
ESC Exit
Advanced ACPI
Configuration
settings.
Use this section to
configure additional
ACPI options.
Advanced ACPI Configuration
ACPI 2.0 Support [Enabled]
Specifies the Advanced Configuration and Power Interface (ACPI) version
supported. Configuration options: [Disabled] [Enabled]
ACPI APIC Support [Enabled]
Allows you to enable or disable the Advanced Configuration and Power Interface
(ACPI) support in the Advanced Programmable Interrupt Controller (APIC). When
set to [Enabled], the ACPI APIC table pointer is included in the RSDT pointer list.
Configuration options: [Disabled] [Enabled]
Headless mode [Disabled]
Allows you to enable or disable the Headless operation mode through ACPI.
Configuration options: [Disabled] [Enabled]
BIOS SETUP UTILITY
Advanced
Advanced ACPI Configuration
ACPI 2.0 Support
[Enabled]
ACPI APIC support
[Enabled]
Headless mode
[Disabled]
Add additional tables
as per ACPI 2.0
specifications.