User`s manual
Chapter 4: AMI BIOS
4-17
ACPIConguration
Use this section to congure the Advanced Conguration and Power Interface
(ACPI) power management settings for your system.
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.
PS2 KB/MS Wakeup
This feature is used to awaken the system from Standby mode by a PS/2 mouse or
PS/2 keyboard. This must be enabled in the system level and Operating System
(O/S) as well, if supported).
S1 (OS Control) - Enables system wake up from S1 (default).
S5 (OS Control) - Enables system wake up from S1/S3/S4/S5.
Force Enabled - Wake up support is always enabled regardless whether it
is disabled in the O/S.
Force Disabled - Wake up support is always disabled regardless whether it
is enabled in the O/S.
Wake on Ring Support
This feature allows support for system wake up if a ring signal is detected through
an optional modem. The selections are Disabled and Enabled.
ACPI Aware O/S
Enable ACPI support if it is supported by the OS to control ACPI through the Operat-
ing System. Otherwise, disable this feature. The options are Yes and No.
Suspend Mode
This setting allows the user to congure the ACPI (Advanced Conguration and
Power Interface) state for the system when it is in the Suspend mode. The options
are S1 (POS), S3 (STR) and Auto.
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.