Power States And Targeted System Power - Intel DH77DF Specification

1.11.1.1 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 12 lists the power states supported by the board along with the associated
system power targets. See the ACPI specification for a complete description of the
various system and power states.
Table 12. Power States and Targeted System Power
Global States Sleeping States
G0 – working S0 – working
state
G1 – sleeping S3 – Suspend to
state RAM. Context
saved to RAM.
G1 – sleeping S4 – Suspend to
state disk. Context
saved to disk.
G2/S5 S5 – Soft off.
Context not saved.
Cold boot is
required.
G3 – No power to the
mechanical off system.
AC power is
disconnected
from the
computer.
Notes:
1. Total system power is dependent on the system configuration, including add-in boards and peripherals
powered by the system chassis' power supply.
2. Dependent on the standby power consumption of wake-up devices used in the system.
Processor
States Device States
C0 – working D0 – working
state.
No power D3 – no power
except for
wake-up logic.
No power D3 – no power
except for
wake-up logic.
No power D3 – no power
except for
wake-up logic.
No power D3 – no power for
wake-up logic,
except when
provided by
battery or
external source.
Product Description
Targeted System
(Note 1)
Power
Full power > 30 W
(Note 2)
Power < 5 W
(Note 2)
Power < 5 W
Power < 5 W (Note 2)
No power to the system.
Service can be performed
safely.
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