User Guide

BIOS Setup 3-35
User’s Manual
These device/events can wake up the
computer…… ……from this state
Power switch Sleeping mode or power off mode
RTC alarm Sleeping mode or power off mode
LAN Sleeping mode or power off mode
Modem Sleeping mode or power off mode
IR command Sleeping mode
USB Sleeping mode
PS/2 keyboard Sleeping mode
PS/2 mouse Sleeping mode
Table 3-6-2: Effect of Pressing the Power Switch
If the system is in this
state……
……and the power switch
is pressed for ……the system enters this
state
Off Less than four seconds Power on
On More than four seconds Soft off/Suspend
On Less than four seconds Fail safe power off
Sleep Less than four seconds Wake up
ACPI Suspend Type:
Two options are available: S1(POS) and S3(STR). The default setting is S1(POS). Generally,
ACPI has six states: System S0 state, S1, S2, S3, S4, S5. S1 and S3 states are described
below:
The S1 (POS) State (POS means Power On Suspend):
While the system is in the S1 sleeping state, its behavior is as described below:
! The processor is not executing instructions. The processor’s complex context is
maintained.
! Dynamic RAM context is maintained.
! Power Resources are in a state compatible with the system S1 state. All Power Resources
that supply a System Level reference of S0 are in the OFF state.
! Devices states are compatible with the current Power Resource states. Only devices
which solely reference Power Resources which are in the ON state for a given device state
can be in that device state. In all other cases, the device is in the D3 (off) state.
! Devices that are enabled to wake the system and that can do so from their current device
state can initiate a hardware event which transitions the system state to S0. This transition
causes the processor to continue execution where it left off.