Power and Signal Distribution

7.3.3 Power Management

These systems include power management functions designed to conserve energy. These functions are provided by a combination of hardware, firmware (BIOS) and software. The system provides the following power management support:

ACPI v2.0 compliant (ACPI modes C1, S1, and S3-S5)

APM 1.2 compliant

U.S. EPA Energy Star 3.0 and 4.0 compliant

Table 7-6 shows the comparison in power states.

Table 7-6.

System Power States

 

 

 

 

 

Power

 

Power

Transition

OS Restart

StateSystem Condition

Consumption

To S0 by [2]

Required

G0, S0, D0

System fully on. OS and

Maximum

N/A

No

 

application is running, all

 

 

 

 

components.

 

 

 

 

 

 

 

 

G1, S1, C1, D1

System on, CPU is executing and

Low

< 2 sec after

No

 

data is held in memory. Some

 

keyboard or

 

 

peripheral subsystems may be on

 

pointing device

 

 

low power. Monitor is blanked.

 

action

 

 

 

 

 

 

G1, S2/3, C2,

System on, CPU not executing,

Low

< 5 sec. after

No

D2 (Standby/or

cache data lost. Memory is

 

keyboard, pointing

 

suspend)

holding data, display and I/O

 

device, or power

 

 

subsystems on low power.

 

button action

 

 

 

 

 

 

G1, S4, D3

System off. CPU, memory, and

Low

<25 sec. after

Yes

(Hibernation)

most subsystems shut down.

 

power button

 

 

Memory image saved to disk for

 

action

 

 

recall on power up.

 

 

 

 

 

 

 

 

G2, S5, D3cold

System off. All components either

Minimum

<35 sec. after

Yes

 

completely shut down or receiving

 

power button

 

 

minimum power to perform system

 

action

 

 

wake-up.

 

 

 

 

 

 

 

 

G3

System off (mechanical). No power

None

 

to any internal components except

 

 

 

 

RTC circuit. [1]

 

 

 

NOTES:

Gn = Global state.

Sn = Sleep state.

Cn = ACPI state.

Dn = PCI state.

[1]Power cord is disconnected for this condition.

[2]Actual transition time dependent on OS and/or application software.

 

Technical Reference Guide

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7-9