Intel D2550DC2 Technical product specification - Page 29

Power Management, 1.11.1 ACPI, Table 6., Effects of Pressing the Power Switch

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Product Description 1.11 Power Management Power management is implemented at several levels, including: • Software support through Advanced Configuration and Power Interface (ACPI) • Hardware support:  Power connector  Fan header  LAN wake capabilities  Instantly Available PC technology  Wake from USB  Power Management Event signal (PME#) wake-up support  WAKE# signal 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 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 poweron/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 8 on page 31) • Support for a front panel power and sleep mode switch Table 6 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 6. 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 ...the system enters this state Power-on (ACPI G0 - working state) Power-off (ACPI G2/G5 - Soft off) Fail safe power-off (ACPI G2/G5 - Soft off) Wake-up (ACPI G0 - working state) Power-off (ACPI G2/G5 - Soft off) 29

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Product Description
29
1.11
Power Management
Power management is implemented at several levels, including:
•
Software support through Advanced Configuration and Power Interface
(ACPI)
•
Hardware support:
Power connector
Fan header
LAN wake capabilities
Instantly Available PC technology
Wake from USB
Power Management Event signal (PME#) wake-up support
WAKE# signal 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 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 8 on page 31)
•
Support for a front panel power and sleep mode switch
Table 6 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 6.
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
Power-off
(ACPI G2/G5 – Soft off)
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)