BIOS SETUP
29
Power
ACPI (Advanced Configuration and Power Interface) is an open industry standard interfaces
enabling OS-directed configuration, power management, and thermal management of
mobile, desktop, and server platforms. It defines five sleeping states, they are :
S1 - The S1 sleeping state is a low wake latency sleeping state. In this state, no system context
is lost (CPU or chip set) and hardware maintains all system context. (also called Power On
Suspend)
S2 - The S2 sleeping state is a low wake latency sleeping state. This state is similar to the S1
sleeping state except that the CPU and system cache context is lost (the OS is responsible
for maintaining the caches and CPU context). Control starts from the processor’s reset
vector after the wake event.
S3 - The S3 sleeping state is a low wake latency sleeping state where all system context is lost
except system memory. CPU, cache, and chip set context are lost in this state. Hardware
maintains memory context and restores some CPU and L2 configuration context. Control
starts from the processor’s reset vector after the wake event. (also called Suspend to RAM)
S4 - The S4 sleeping state is the lowest power, longest wake latency sleeping state supported
by ACPI. In order to reduce power to a minimum, it is assumed that the hardware platform
has powered off all devices. Platform context is maintained. (also called Suspend to Disk)
S5 - The S5 state is similar to the S4 state except that the OS does not save any context. The
system is in the “soft” off state and requires a complete boot when it wakes. Software uses
a different state value to distinguish between the S5 state and the S4 state to allow for initial
boot operations within the BIOS to distinguish whether or not the boot is going to wake from
a saved memory image.
► ACPI Sleep State
This item is used to set the energy saving mode of the ACPI function. When you select “S1
(POS)” mode, the power is always on and computer can be resumed at any time. When
you select “S3 (STR)” mode, the power will be down after a period of time. The status of
the computer before it entering STR will be saved in memory, and the computer can quickly
ACPI Sleep State
[S3]
Resume By PS2 KB/Mouse
[Enabled]
Resume By USB Device(s)
[Enabled]
Resume By PCIE Device(s)
[Disabled]
Resume By Onboard LAN
[Disabled]
Resume By RTC
[Disabled]
Energy-using Products
[Enabled]
Restore AC Power Loss
[Power Off]
Select the highest ACPI
sleep state the system
will enter when the
SUSPEND button is pressed.
→ ←: Select Screen
↑ ↓/Click: Select Item
Enter/Dbl Click: Select
+/-: Change Opt.
F1: General Help
F2: Previous Values
F3: Optimized Defaults
F4: Save & Exit
ESC/Right Click: Exit
Version 2.15.1236. Copyright (C) 2013 American Megatrends, Inc.
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