HP kp721av 用户手册

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. 

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.

G0, S0, D0

System fully on. OS and 

application is running, all 

components.

Maximum

N/A

No

G1, S1, C1, D1 System on, CPU is executing and 

data is held in memory. Some 

peripheral subsystems may be on 

low power. Monitor is blanked. 

Low

< 2 sec after 

keyboard or 

pointing device 

action

No

G1, S2/3, C2, 

D2 (Standby/or 

suspend)

System on, CPU not executing, 

cache data lost. Memory is 

holding data, display and I/O 

subsystems on low power.

Low

< 5 sec. after 

keyboard, pointing 

device, or power 

button action

No

G1, S4, D3 

(Hibernation)

System off. CPU, memory, and 

most subsystems shut down. 

Memory image saved to disk for 

recall on power up.

Low

<25 sec. after 

power button 

action

Yes

G2, S5, D3

cold

System off. All components either 

completely shut down or receiving 

minimum power to perform system 

wake-up.  

Minimum

<35 sec. after 

power button 

action

Yes

G3

System off (mechanical). No power 

to any internal components except 

RTC circuit. [1]

None

—

—