Intel S845WD1-E Product Guide - Page 27

ACPI, require an ACPI-aware driver, video displays, and hard disk drives - power switch

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Page 27 highlights

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 S845WD1H server board 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 7, page29) • Support for a front panel power and sleep mode switch Table 5 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 5. Effects of Pressing the Power Switch ...and the power switch is If the system is in this state... pressed for Off (ACPI G2/G5 - Soft off) Less than four seconds On (ACPI G0 - working state) Less than four seconds On (ACPI G0 - working state) More than four seconds Sleep (ACPI G1 - sleeping state) Less than four seconds Sleep (ACPI G1 - sleeping state) More than four seconds ...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) Description 27

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Description
27
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 S845WD1H server board 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 7, page29)
•
Support for a front panel power and sleep mode switch
Table 5 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 5.
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)