
Chapter 7: BIOS
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ACPI Version Features
The options are ACPI v1.0, ACPI v2.0 and ACPI v3.0. Please refer to ACPI's website
for further explanation: http://www.acpi.info/.
ACPI Suspend Mode
This option is used to select the ACPI State that is used for system suspend. The
options are S1 (POS), S3 (STR) and Auto.
S1 (POS) - All processor caches are erased, and stops executing instructions.
Power to the CPU(s) and RAM is maintained, but RAM is refreshed.
S3 (STR) - The CPU has no power and the power supply goes on reduced power
mode. However, main memory (RAM) is still powered.
ACPI APIC Support
Select Enabled to include the ACPI APIC Table Pointer in the RSDT (Root System
Description Table) pointer list. The options are Enabled and Disabled.
APIC ACPI SCI IRQ
When this item is set to Enabled, APIC ACPI SCI IRQ is supported by the system.
The options are Enabled and Disabled.
Headless Mode
This feature is used to enable system to function without a keyboard, monitor or
mouse attached The options are Enabled and Disabled.
NUMA Support
Select Enabled to enable Non-Uniform Memory Access support to improve CPU
performance for a system that has an OS with NUMA support. The options are
Enabled and Disabled.
USB Device Wakeup from S3/S4
Select to Enabled to allow USB devices to wakeup from S3/S4 state. The options
are Enabled and Disabled.
High Performance Event Timer
Select Enabled to activate the High Performance Event Timer (HPET) that produces
periodic interrupts at a much higher frequency than a Real-time Clock (RTC) does in
synchronizing multimedia streams, providing smooth playback and reducing the de-
pendency on other timestamp calculation devices, such as an x86 RDTSC Instruc-
tion embedded in the CPU. The High Performance Event Timer is used to replace
the 8254 Programmable Interval Timer. The options are Enabled and Disabled.
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