Abit SE6 User Manual page 39

BIOS Setup
http://www.teleport.com/~acpi/acpihtml/home.htm
ACPI requires an ACPI-aware operating system. ACPI features include:
! Plug and Play (including bus and device enumeration) and APM functionality normally contained in
the BIOS.
! Power management control of individual devices, add-in cards (some add-in cards may require an
ACPI-aware driver), video displays, and hard disk drives.
! A Soft-off feature that enables the operating system to power off the computer.
! Support for multiple wake-up events (see Table 3-1).
! Support for a front panel power and sleep mode switch. Table 3-2 describes the system states based on
how long the power switch is pressed, depending on how ACPI is configured with an ACPI-aware
operating system.
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 3-1: 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 3-2: Effect of Pressing the Power Switch
If the system is in this
state......
Off
On
On
Sleep
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:
......and the power switch is
pressed for
Less than four seconds
More than four seconds
Less than four seconds
Less than four seconds
......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 or power off mode
Sleeping mode or power off mode
......the system enters this
state
Power on
Soft off/Suspend
Fail safe power off
Wake up
3-19
User's Manual