16

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 4 lists the power states supported by the Compute Stick along with the associated system

power targets. See the ACPI specification for a complete description of the various system and

power states.

Table 4. Power States and Targeted System Power

Global States

Sleeping States

Processor States

Device States

Targeted System

G0 – working

state

S0 – working

C0 – working

D0 – working state.

Full power

G1 – sleeping

state

S3 – Suspend to RAM.

Context saved to

RAM.

No power

D3 – no power

except for wake-up

logic.

G1 – sleeping

state

S4 – Suspend to disk.

Context saved to disk.

No power

D3 – no power

except for wake-up

logic.

G2/S5

S5 – Soft off. Context

not saved. Cold boot

is required.

No power

D3 – no power

except for wake-up

logic.

G3 – mechanical

off

AC power is

disconnected

from the

computer.

No power to the

system.

No power

D3 – no power for

wake-up logic.

No power to the system.

Service can be performed

safely.

Notes:

1.

Total system power is dependent on the system configuration and peripherals powered by the system power supply.

2.

Dependent on the standby power consumption of wake-up devices used in the system.