Windows 2000 - HP 742n - Pavilion - 512 MB RAM White Paper

This illustration shows how the Hibernate mode works.
Hibernate
n
o
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
n
o
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?
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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). . . .
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