HP 742n - Pavilion - 512 MB RAM Beyaz Kitap - Sayfa 4

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HP 742n - Pavilion - 512 MB RAM Beyaz Kitap

This illustration shows how the Hibernate mode works.

Hibernate

The PC's system context (contents of main memory,

position of all programs, etc.) is stored on hard disk

and then all devices are powered off. The PC goes

into state S4.

When the PC gets a wakeup command, it initiates the

BIOS then reloads the system context from the hard

disk. In this way the PC starts up very quickly from

where it left off, becoming quickly available for the task

at hand.

Wake Up from Hibernate

The events that trigger the PC to wake up from

Hibernate mode are:

Pressing the PC's power button (or the space bar on

•

PCs that support this feature)

A scheduled event

•

(such as a late-night backup)

A wakeup command from the network

•

(typically, for desktop management tasks such as an

automatic software upgrade)

An incoming call on a modem.

•

Suspend to RAM Mode

The new "Suspend to RAM" mode (S3) works in a

similar fashion, except that the system context is saved

to main memory. This state uses more power since the

main memory must be maintained to preserve the

system context. However, since main memory is faster

than the hard disk, wakeup takes less time from

"Suspend to RAM" mode.

The same events that trigger the PC to wake up from

Hibernate mode also work for Suspend mode.

Additionally, pressing any key on the PS/2 keyboard

can also wake the PC up from Suspend to RAM mode

(this keyboard wakeup can be disabled in the OS

power management options).

Under Windows 2000, ensure the OS option

"Suspend to RAM" has been selected in

Start>Settings>Control Panel>Power Options

if you want to activate this mode.

Which Operating Systems

Support ACPI?

Windows 2000

Windows 2000 is currently the operating system that

has the most complete ACPI power management

features.

From the Windows Start menu, the user has the option

to Shut Down (S5) or go into Hibernate mode (S4) if

this is enabled in Power Management, or go into

Standby (S3 or "Suspend to RAM").

Windows 2000 power management options are

configurable from the Power Options icon in

Start>Settings>Control Panel. Here you can set the

action of the PC's power switch to instigate Standby

(S1 or S3), Hibernate (S4), or shut down the PC (S5).

You can also select the devices allowed to signal a

wake-up to the system. The wake-up is carried out

when an event is received from any of the devices you

have set as 'active' in the Power Management tab of

Device Manager (the Device Manager can be opened from

Start>Settings>Control Panel>System>Device Manager). . . .