Intel D850EMV2 Product Specification - Page 39

Power Management

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Product Description 1.14 Power Management Power management is implemented at several levels, including: • Software support using ACPI • Hardware support:  Power connector  Fan connectors  LAN wake capabilities  Instantly Available technology  Wake from USB  Wake from PS/2 keyboard  PME# wake-up support 1.14.1 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 boards D850EMD2/D850EMV2 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 41). • 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 S5 - soft-off) On (ACPI S0 - working state) On (ACPI S0 - working state) Sleep (ACPI S1 - sleeping state) Sleep (ACPI S1 - 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 S0 - working state) Soft-off/Standby (ACPI S1 - sleeping state) Fail-safe power-off (ACPI S5 - soft-off) Wake-up (ACPI S0 - working state) Power-off (ACPI S5 - soft-off) For information about Refer to The desktop boards D850EMD2/D850EMV2's compliance level with ACPI Section 1.5, page 19 39

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Product Description
39
1.14 Power Management
Power management is implemented at several levels, including:
•
Software support using ACPI
•
Hardware support:
Power connector
Fan connectors
LAN wake capabilities
Instantly Available technology
Wake from USB
Wake from PS/2 keyboard
PME# wake-up support
1.14.1
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 boards D850EMD2/D850EMV2
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 41).
•
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 S5
–
soft-off)
Less than four seconds
Power-on
(ACPI S0
–
working state)
On
(ACPI S0
–
working state)
Less than four seconds
Soft-off/Standby
(ACPI S1
–
sleeping state)
On
(ACPI S0
–
working state)
More than four seconds
Fail-safe power-off
(ACPI S5
–
soft-off)
Sleep
(ACPI S1
–
sleeping state)
Less than four seconds
Wake-up
(ACPI S0
–
working state)
Sleep
(ACPI S1
–
sleeping state)
More than four seconds
Power-off
(ACPI S5
–
soft-off)
For information about
Refer to
The desktop boards D850EMD2/D850EMV2
’
s compliance level with ACPI
Section 1.5, page 19