Intel BOXD865PCDL Product Specification - Page 31

System States and Power States

Page 31 highlights

Product Description  Power Management Event signal (PME#) wake-up support 1.11.1 ACPI ACPI gives the operating system direct control over the power management and Plug and Play functions of a computer. The use of ACPI with the Desktop Board D865PCD requires an operating system that provides full ACPI support. ACPI features include: • Plug and Play (including bus and device enumeration) • Power management control of individual devices, add-in boards (some add-in boards may require an ACPI-aware driver), video displays, and hard disk drives • Methods for achieving less than 15-watt system operation in the power-on/standby sleeping state • A Soft-off feature that enables the operating system to power-off the computer • Support for multiple wake-up events (see Table 9 on page 32) • Support for a front panel power and sleep mode switch Table 7 lists the system states based on how long the power switch is pressed, depending on how ACPI is configured with an ACPI-aware operating system. Table 7. Effects of Pressing the Power Switch If the system is in this state... Off (ACPI G2/G5 - Soft off) On (ACPI G0 - working state) On (ACPI G0 - working state) Sleep (ACPI G1 - sleeping state) Sleep (ACPI G1 - sleeping state) ...and the power switch is pressed for Less than four seconds Less than four seconds More than four seconds Less than four seconds More than four seconds For information about The Desktop Boards' compliance level with ACPI ...the system enters this state Power-on (ACPI G0 - working state) Soft-off/Standby (ACPI G1 - sleeping state) Fail safe power-off (ACPI G2/G5 - Soft off) Wake-up (ACPI G0 - working state) Power-off (ACPI G2/G5 - Soft off) Refer to Section 1.3, page 16 1.11.1.1 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 8 lists the power states supported by the Desktop Board D865PCD and along with the associated system power targets. See the ACPI specification for a complete description of the various system and power states. 31

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Product Description
31
Power Management Event signal (PME#) wake-up support
1.11.1
ACPI
ACPI gives the operating system direct control over the power management and Plug and Play
functions of a computer.
The use of ACPI with the Desktop Board D865PCD requires an
operating system that provides full ACPI support.
ACPI features include:
Plug and Play (including bus and device enumeration)
Power management control of individual devices, add-in boards (some add-in boards may
require an ACPI-aware driver), video displays, and hard disk drives
Methods for achieving less than 15-watt system operation in the power-on/standby
sleeping state
A Soft-off feature that enables the operating system to power-off the computer
Support for multiple wake-up events (see Table 9 on page 32)
Support for a front panel power and sleep mode switch
Table 7 lists the system states based on how long the power switch is pressed, depending on how
ACPI is configured with an ACPI-aware operating system.
Table 7.
Effects 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
(ACPI G2/G5
Soft off)
Less than four seconds
Power-on
(ACPI G0
working state)
On
(ACPI G0
working state)
Less than four seconds
Soft-off/Standby
(ACPI G1
sleeping state)
On
(ACPI G0
working state)
More than four seconds
Fail safe power-off
(ACPI G2/G5
Soft off)
Sleep
(ACPI G1
sleeping state)
Less than four seconds
Wake-up
(ACPI G0
working state)
Sleep
(ACPI G1
sleeping state)
More than four seconds
Power-off
(ACPI G2/G5
Soft off)
For information about
Refer to
The Desktop Boards
compliance level with ACPI
Section 1.3, page 16
1.11.1.1
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 8 lists the power states supported by the Desktop Board D865PCD and along with the
associated system power targets.
See the ACPI specification for a complete description of the
various system and power states.