Intel D865GLC Manual - Page 30

System States and Power States - video drivers

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• 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 • Support for a front panel power and sleep mode switch Table 8 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 8: Effects of Pressing the Power Switch If the system is in this ...and the power switch is state... pressed for Off Less that four seconds (ACPI G2/G5 - soft off) On Less than four seconds (ACPI G0 - working state) On More than four seconds (ACPI G0 - working state) Sleep Less that four seconds (ACPI G1 - sleeping state) Sleep More than fore seconds (ACPI G1 - sleeping state) ...the system enters this state Power-on (ACPI G0 - working) 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) 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 9 lists the power states supported by the D865GLC motherboard along with the associated system power targets. See the ACPI specification for a complete description of the various system and power states. Table 9: Power States and Targeted System Power Global States Sleeping States Processor States G0 - working S0 - working C0 - working state G1 - sleeping S1 - Processor C1 - stop grant state stopped G1 - sleeping S3 - Suspend to No power state RAM. G1 - Sleeping S4 - Suspended No power state to disk. G2/S5 S5 - Soft off. No power saved Device States D0 - working state D1, D2, D3 - device specification specific D3 - no power except for wake-up logic D3 - no power except for wake-up logic D3 - no power except for wake-up logic Targeted System Power Full Power > 30W 5W < power < 52.5W Power < 5W Power < 5W Power < 5W D865GLC Motherboard Manual 29

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D865GLC Motherboard Manual
29
•
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
•
Support for a front panel power and sleep mode switch
Table 8 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 8:
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 that four seconds
Power-on
(ACPI G0 – working)
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 that four seconds
Wake-up
(ACPI G0 – working state)
Sleep
(ACPI G1 – sleeping state)
More than fore seconds
Power-off
(ACPI G2/G5 – Soft off)
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 9 lists the power states supported by the D865GLC motherboard along with
the associated system power targets. See the ACPI specification for a complete
description of the various system and power states.
Table 9:
Power States and Targeted System Power
Global States
Sleeping States
Processor
States
Device States
Targeted System
Power
G0 – working
state
S0 – working
C0 – working
D0 – working state
Full Power > 30W
G1 – sleeping
state
S1 – Processor
stopped
C1 – stop grant
D1, D2, D3 – device
specification specific
5W < power <
52.5W
G1 – sleeping
state
S3 – Suspend to
RAM.
No power
D3 – no power except
for wake-up logic
Power < 5W
G1 – Sleeping
state
S4 – Suspended
to disk.
No power
D3 – no power except
for wake-up logic
Power < 5W
G2/S5
S5 – Soft off.
saved
No power
D3 – no power except
for wake-up logic
Power < 5W