35
3
Power
ACPI (Advanced Coniguration and Power Interface) is an open industry standard interfaces
enabling OS-directed coniguration, power management, and thermal management of mobile,
desktop, and server platforms. It deines ive 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 respon-
sible 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 coniguration 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
[S3]
Resume By PS2 Keyboard
[Enabled]
Resume By PS2 Mouse
[Enabled]
Resume By Onboard LAN
[Disabled]
Resume By USB Device(s)
[Enabled]
Resume By PCIE PME
[Disabled]
Resume By RTC
[Disabled]
Energy-using Products
[Enabled]
Restore AC Power Loss
[Power Off]
Version 2.02.1205. Copyright (C) 2010 American Megatrends, Inc.
: Select Screen
: Select Item
Enter: Select
+/-: Change Opt.
F1: General Help
F2: Previous Values
F3: Optimized Defaults
F4: Save � Exit
ESC: Exit
Select the highest ACPI sleep
state. The system will enter
when the SUSPEND button is
pressed.
Aptio Setup Utility - Copyright (C) 2010 American Megatrends, Inc.
Main Advanced Chipset Boot Power Health Security Save . Exit
Power
