Abit WB6 User Manual page 62

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System States and Power States
Under ACPI, the operating system directs all system and device power state transitions. The
operating system puts devices in and out of low-power states based on user preferences and
knowledge of how devices are being used by applications. Devices that are not being used
can be turned off. The operating system uses information from applications and user settings
to put the system as a whole into a low-power state.
Table 3-6-1: Wake Up Device and Events
The table below describes which devices or specific events can wake the computer from
specific states.
These device/events can wake up the
computer......
Power switch
RTC alarm
LAN
Modem
IR command
USB
PS/2 keyboard
PS/2 mouse
Table 3-6-2: Effect of Pressing the Power Switch
If the system is in this ......and the power switch
state...... is pressed for
Off Less than four seconds
On More than four seconds
On Less than four seconds
Sleep Less than four seconds
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
WB6
......from this state
Sleeping mode or power off mode
Sleeping mode or power off mode
Sleeping mode or power off mode
Sleeping mode or power off mode
Sleeping mode
Sleeping mode
Sleeping mode
Sleeping mode
......the system enters this
state
Power on
Soft off/Suspend
Fail safe power off
Wake up
Chapter3