Product Description
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1.13.1.2.1 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 9 lists the power states supported by the D815EEA board 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 CPU States Device States
Targeted System Power
(Note 1)
G0 – working
state
S0 – working C0 – working D0 – working
state
Full power > 30 W
G1 – sleeping
state
S1 – CPU stopped C1 – stop
grant
D1, D2, D3 –
device
specification
specific.
5 W < power < 30 W
G1 – sleeping
state
S3 – Suspend to
RAM. Context
saved to RAM.
No power D3 – no power
except for wake
up logic.
Power < 5 W (Note 2)
G2/S5 S5 – Soft off.
Context not saved.
Cold boot is
required.
No power D3 – no power
except for wake
up logic.
Power < 5 W (Note 2)
G3 –
mechanical off
AC power is
disconnected
from the
computer.
No power to the
system.
No power D3 – no power for
wake up logic,
except when
provided by
battery or external
source.
No power to the system so
that service can be
performed.
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.
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