Introduction of BIOS 3-23
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…… ……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 3-2: 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
Note 1
On Less than four seconds Sleeping mode
Note 1
Sleep Less than four seconds Wake up
Note 1: The actual state here will depend on your operating system (ACPI Support)
settings.
Note 2: If you enable the ACPI function in the BIOS setup, this function will not
work.
Power Management:
Four options:
" User Define
User Define defines the delay for accessing the power modes.
" Min Saving
When the three saving modes are enabled, the system is set up for
minimum power savings.
Doze = 1 hour
Standby = 1 hour
Suspend = 1 hour
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