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Chapter 3
VL6
Play functions of a computer.
If you want ACPI functions to work normally, you should notice two things. One is your
operating system must support ACPI, as of now only Microsoft
®
Windows
®
98 supports
these functions. The second thing is that all devices and add-on cards in your system, must
fully support ACPI, both hardware and software (drivers). If you want to know if your
devices or add-on cards support ACPI or not, please contact the device or add-on card
manufacture for more information. If you want to know more about ACPI specifications,
please go to the address below for more detailed information:
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.
Note
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.
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
Sleep button
Sleeping mode
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