Intel D845GRG Technical Product Specification for Intel Desktop Boards using t - Page 34

Power Management - desktop board drivers

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Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset 1.13 Power Management Power management is implemented at several levels, including: • Software support through Advanced Configuration and Power Interface (ACPI) • Hardware support:  Power connector  Fan connectors  LAN wake capabilities  Instantly Available PC technology  Resume on Ring  Wake from USB  Wake from PS/2 devices  Power Management Event signal (PME#) wake-up support 1.13.1 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 these Desktop Boards 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 12 on page 36) • Support for a front panel power and sleep mode switch Table 10 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 10. 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) 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) For information about The Desktop Boards' compliance level with ACPI Refer to Section 1.4, page 13 34

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Technical Product Specification for Intel Desktop Boards using the Intel 845G Chipset
34
1.13 Power Management
Power management is implemented at several levels, including:
•
Software support through Advanced Configuration and Power Interface (ACPI)
•
Hardware support:
Power connector
Fan connectors
LAN wake capabilities
Instantly Available PC technology
Resume on Ring
Wake from USB
Wake from PS/2 devices
Power Management Event signal (PME#) wake-up support
1.13.1
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 these Desktop Boards 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 12 on page 36)
•
Support for a front panel power and sleep mode switch
Table 10 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 10.
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 1.4, page 13