Viglen D865GLC - Desktop Board Motherboard Manual page 30

• 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...
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)
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
G0 – working S0 – working
state
G1 – sleeping S1 – Processor
state stopped
G1 – sleeping S3 – Suspend to
state RAM.
G1 – Sleeping S4 – Suspended
state to disk.
G2/S5 S5 – Soft off.
saved
...and the power switch is
pressed for
Less that four seconds
Less than four seconds
More than four seconds
Less that four seconds
More than fore seconds
Processor
States
C0 – working
C1 – stop grant
No power
No power
No power
D865GLC Motherboard Manual
...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)
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
29