Power Management

Item

Specification

 

 

Power management standard

ACPI 1.0b/2.0/3.0

 

 

System power management states

Mechanical Off (G3) – All system devices are turned off

 

completely.

 

Soft Off (G2/S5) – OS initiated shutdown. All devices

 

in the system are turned off completely.

 

Working (G0/S0) – Individual devices such as the

 

processor and hard disk may be power managed in

 

this state.

 

S3 Sleeping State

 

CPU set power down

 

VGA suspend

 

Audio power down

 

Hard disk power down

 

Optical drive power down

 

Card reader function suspend

 

S4 Sleeping State (hibernation mode) – All system

 

states and data are saved onto disk before power

 

shutdown. The same session is restored the next time

 

the system is powered on.

 

 

Processor power management states

To further conserve power in a Working state, the

 

processor enters a low-power state when the OS is idle.

 

C1 state – CPU halt instruction

 

C2 state – CPU stop grant state

 

C3 state – CPU stop clock state

 

 

Appendix C

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Acer 4520 manual Power Management

4520 specifications

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