Abit AB-NV7-133R User Manual page 49

Introducing the BIOS
! 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 3-6-1).
! Support for a front panel power and sleep mode switch. Table 3-6-2 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.
If you enable the ACPI function in the BIOS setup, the SMI switch function will not work.
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.
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
If the system is in this
state......
Off
On
On
Sleep
ACPI Suspend Type:
Three options are available: S1 (Power On-Suspend) ( S3 (Suspend-T0-RAM) ( S1&S3. The default
setting is S1 (Power On-Suspend). POS is "Power On Suspend", and STR is "Suspend To RAM".
Generally, ACPI has six states: System S0 state, S1 state, S2 state, S3 state, S4 state, S5 state. S1 and S3
states are described below:
Table 3-6-1: Wake Up Device and Events
Table 3-6-2: Effect of Pressing the Power Switch
......and the power switch is
pressed for
Less than four seconds
More than four seconds
Less than four seconds
Less than four seconds
Note
......from this state
Sleeping mode or power off mode
Sleeping mode
Sleeping mode
Sleeping 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
3-21
User's Manual