Compaq nw9440 - Mobile Workstation User manual

Power
Document Part Number: 396855-001
March 2006
This guide explains how the computer uses power.

Power ii
Contents
1 Power control and light locations
2 Power sources
Connecting the AC adapter . . . . . . . . . . . . . . . . . . . . 2–2
3 Standby and hibernation
Standby. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
Hibernation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Initiating standby, hibernation or shutdown. . . . . . . . . . . 3–4
When you leave your work . . . . . . . . . . . . . . . . . . . . 3–4
When a reliable power supply is unavailable . . . . . . 3–5
When using wireless communication, or readable
or writable drive media . . . . . . . . . . . . . . . . . . . . . . . 3–6
4 Default power settings
Turning the computer or display on or off . . . . . . . . . . . . 4–2
Using emergency shutdown procedures. . . . . . . . . . . . . . 4–3
Initiating or resuming from standby. . . . . . . . . . . . . . . . . 4–3
Initiating or restoring from hibernation . . . . . . . . . . . . . . 4–5
5 Power options
Accessing Power Options Properties . . . . . . . . . . . . . . . . 5–1
Displaying the Power Meter icon. . . . . . . . . . . . . . . . . . . 5–2
Setting or changing a power scheme . . . . . . . . . . . . . . . . 5–3
Setting a security prompt . . . . . . . . . . . . . . . . . . . . . . . . . 5–3

iii Power
Contents
6 Processor performance controls
7 Battery packs
Identifying battery packs . . . . . . . . . . . . . . . . . . . . . . . . . 7–2
Inserting or removing the primary battery pack. . . . . . . . 7–3
Charging multiple battery packs . . . . . . . . . . . . . . . . . . . 7–5
Charging a battery pack . . . . . . . . . . . . . . . . . . . . . . . . . . 7–6
Monitoring the charge of a battery pack . . . . . . . . . . 7–8
Managing low-battery conditions . . . . . . . . . . . . . . . . . 7–10
Identifying low-battery conditions . . . . . . . . . . . . . 7–10
Resolving low-battery conditions . . . . . . . . . . . . . . 7–11
Calibrating a battery pack . . . . . . . . . . . . . . . . . . . . . . . 7–13
When to calibrate. . . . . . . . . . . . . . . . . . . . . . . . . . . 7–13
How to calibrate. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–13
Conserving battery power . . . . . . . . . . . . . . . . . . . . . . . 7–18
Conserving power as you work . . . . . . . . . . . . . . . . 7–18
Selecting power conservation settings. . . . . . . . . . . 7–19
Storing a battery pack. . . . . . . . . . . . . . . . . . . . . . . . . . . 7–20
Disposing of a used battery pack . . . . . . . . . . . . . . . . . . 7–21
Index

Power 1–1
1
Power control and
light locations
The following illustration and table identify and describe the
power control and light locations.
✎Your computer may look slightly different from the illustration
in this section.

1–2 Power
Power control and light locations
Component Description
1Power lights* (2) On: The computer is on.
Blinking: The computer is in standby.
Blinking rapidly: An HP Smart AC
Adapter (hereafter referred to as AC
adapter) with a higher power rating
should be connected.
Off: The computer is off or in
hibernation.
(Continued)

Power control and light locations
Power 1–3
2Power button When the computer is
■Off, press to turn on the computer.
■On, press to enter hibernation.
■In standby, briefly press to exit
standby.
■In hibernation, briefly press to exit
hibernation.
If the computer has stopped
responding and Microsoft® Windows®
shutdown procedures cannot be used,
press and hold the power button for
at least 5 seconds to turn off the
computer.
3fn+f3 Initiates standby.
4Battery light Amber: A battery pack is charging.
Green: A battery pack is close to full
charge capacity.
Blinking amber: A battery pack that is
the only available power source has
reached a low-battery condition.
When the battery reaches a
critical
low-battery condition, the battery light
begins blinking more quickly.
Off: If the computer is plugged into an
external power source, the light is
turned off when all batteries in the
computer are fully charged. If the
computer is not plugged into an
external power source, the light stays
off until the battery reaches a
low-battery condition.
*There are 2 power lights. Both display the same information. The light on
the power button is visible only when the computer is open; the other power
light is always visible on the front of the computer.
Component Description

Power 2–1
2
Power sources
The computer can run on internal or external AC power. The
following table indicates the best power source for common
tasks.
✎Older AC adapters will not work with this computer.
Task Recommended power source
Work in most software
applications
■Charged battery pack in the computer
■External power supplied through one of
the following devices:
❐AC adapter included with the computer
❐Optional docking device
❐Optional power adapter
Charge or calibrate a battery
pack in the computer
External power supplied through
■AC adapter included with the computer
■Optional docking device
■Optional power adapter
ÅDo not charge the computer battery pack
on board aircraft.
Install or modify system
software or write to a CD
or DVD
External power supplied through
■AC adapter included with the computer
■Optional docking device
■Optional power adapter

2–2 Power
Power sources
Connecting the AC adapter
ÅWARNING: To reduce the risk of electric shock or damage to the
equipment:
■Plug the power cord into an AC outlet that is easily accessible at all
times.
■Disconnect power from the computer by unplugging the power cord
from the AC outlet (not by unplugging the power cord from the
computer).
■If provided with a 3-pin attachment plug on the power cord, plug
the cord into a grounded (earthed) 3-pin outlet. Do not disable the
power cord grounding pin; for example, by attaching a 2-pin
adapter. The grounding pin is an important safety feature. It is
possible to receive an electric shock from a system that is not
properly grounded.

Power sources
Power 2–3
To connect the computer to external AC power:
1. Plug the AC adapter into the power connector 1on the left
side of the computer.
2. Plug the power cord into the AC adapter 2.
3. Plug the other end of the power cord into an AC outlet 3.
Depending on the AC adapter connected, one of the following
pop-up messages may be displayed after turning on the computer:
■“Smart AC adapter power output is too low for this
computer.” Clicking the message will display the following
additional information:
“The output power of the HP Smart AC Adapter connected
to your computer is insufficient. Please connect a higher
capacity adapter.”
■“For full performance, connect a higher capacity AC
adapter.” Clicking the message will display the following
additional information:
“The HP Smart AC Adapter connected will power the
computer, but at reduced performance. Please connect a
higher capacity adapter for full performance.”

Power 3–1
3
Standby and hibernation
Standby and hibernation are energy-saving features that conserve
power and reduce startup time. They can be initiated by you or by
the system. For more information, refer to “Initiating standby,
hibernation or shutdown.”
Standby
ÄCAUTION: To avoid a complete battery discharge, do not leave the
computer in standby for extended periods. Connect the computer to an
external power source.
Standby reduces power to system components that are not in use.
When standby is initiated, your work is stored in random access
memory (RAM), and then the screen is cleared. When the
computer is in standby, the power lights blink. When you resume
from standby, your work returns to the screen where you left off.
ÄCAUTION: To reduce the risk of information loss, save your work
before initiating standby.

3–2 Power
Standby and hibernation
Hibernation
ÄCAUTION: If the configuration of the computer is changed during
hibernation, resuming from hibernation may not be possible. When the
computer is in hibernation:
■Do not dock the computer in or undock the computer from a
docking device.
■Do not add or remove memory modules.
■Do not insert or remove hard drives or optical drives.
■Do not connect or disconnect external devices.
■Do not insert or remove an external media card.
Hibernation saves your work to a hibernation file on the hard
drive, and then shuts down the computer. The power lights are
turned off. When you restore from hibernation, your work returns
to the screen where you left off. If a power-on password has been
set, you must enter that password to restore from hibernation.

Standby and hibernation
Power 3–3
ÄCAUTION: To reduce the risk of information loss, save your work
before initiating hibernation.
You can disable hibernation. However, if hibernation is disabled
and the system reaches a low-battery condition, the system will
not automatically save your work while power is on or when
standby has been initiated.
Use Power Options in Microsoft® Windows® Control Panel to
reenable hibernation:
»Select Start > Control Panel > Performance and
Maintenance > Power Options > Hibernate tab.
Be sure that the Enable hibernation check box is selected.
To set the time interval after which the system initiates
hibernation:
1. Select Start > Control Panel > Performance and
Maintenance > Power Options.
2. Click one of the intervals in the System hibernates list.

3–4 Power
Standby and hibernation
Initiating standby, hibernation or
shutdown
The following sections explain when to initiate standby or
hibernation and when to shut down the computer.
✎You cannot initiate any type of networking communications or
perform any computer functions while the computer is in
standby or hibernation.
When you leave your work
When standby is initiated, your work is stored in random access
memory (RAM), and then the screen is cleared. When the
computer is in standby, it uses less power than when it is on. Your
work returns instantly to the screen when you resume from
standby.
Initiating hibernation saves your work to a hibernation file on the
hard drive, and then shuts down the computer. When the
computer is in hibernation, it uses much less power than when it
is in standby.
When the computer will be unused and disconnected from
external power for an extended period, shut down the computer
and remove the battery pack to extend the life of the battery pack.
For details on battery pack storage, refer to “Storing a battery
pack.”

Standby and hibernation
Power 3–5
When a reliable power supply is
unavailable
Be sure that hibernation remains enabled, especially if you are
operating the computer on battery power and do not have access
to an external power supply. If the battery pack fails, hibernation
saves your work to a hibernation file and shuts down the
computer.
If you pause your work when the power supply is uncertain, take
one of the following actions:
■Save your work, and then initiate standby.
■Initiate hibernation.
■Shut down the computer.

3–6 Power
Standby and hibernation
When using wireless communication, or
readable or writable drive media
ÄCAUTION: To prevent possible audio and video degradation, or loss
of audio or video playback functionality, do not initiate standby or
hibernation while reading or writing to a CD, DVD, or external media
card. To prevent loss of information, do not initiate standby or
hibernation when writing to a CD or DVD.
Standby and hibernation interfere with the use of Bluetooth® and
WLAN communication, and media.
Note the following guidelines:
■If the computer is in standby or hibernation, you cannot
initiate a Bluetooth or WLAN transmission.
■If standby or hibernation is accidentally initiated during
playback of a drive medium such as a CD, a DVD, or an
external media card:
❏Your playback may be interrupted.
❏You may see the following warning message: “Putting the
computer into hibernation or standby may stop the
playback. Do you want to continue?” Click No.
❏You may need to restart the media to resume audio and
video playback.

Power 4–1
4
Default power settings
This section explains the default standby, hibernation, and
shutdown procedures. For information about changing the
function of some of the power features on the computer, refer
to “Power options.”
The controls and lights discussed in this chapter are illustrated in
“Power control and light locations.”

4–2 Power
Default power settings
Turning the computer or display
on or off
Task Procedure Result
Turn on the
computer.
Press the power button. ■The power lights are
turned on.
✎If the power lights
blink rapidly, an
AC adapter with a
higher power
rating should be
connected.
■The operating system
loads.
Shut down the
computer.*
1. Save your work and close all
open applications.
2. Shut down the computer
through the operating
system by selecting Start >
Turn Off Computer >
Turn Off.*
✎If the system is
unresponsive and you are
unable to shut down the
computer with these
procedures, refer to “Using
emergency shutdown
procedures.”
■The power lights are
turned off.
■The operating system
shuts down.
■The computer is
turned off.
Turn off the
display while the
power is on.
Close the computer. Closing the computer
activates the display
switch, which initiates
standby.
*If you have been registered to a network domain, the button you click will be
called Shut Down instead of Turn Off Computer.

Default power settings
Power 4–3
Using emergency shutdown
procedures
ÄCAUTION: Emergency shutdown procedures result in the loss of
unsaved information.
If the computer is unresponsive and you are unable to use normal
Windows shutdown procedures, try the following emergency
procedures in the sequence provided:
■Press ctrl+alt+delete. Then, select Shut Down > Turn Off.
■Press and hold the power button for at least 5 seconds.
■Disconnect the computer from external power and remove
the battery pack. For more information about removing and
storing the battery pack, refer to “Battery packs.”
Initiating or resuming from standby
Task Procedure Result
Initiate standby. ■With the computer on, press fn+f3.
■In Windows XP Home, select
Start > Turn Off Computer >
Stand by.
– or –
In Windows XP Professional, select
Start > Turn Off Computer >
Stand by. (If Stand by is not
displayed, press the down arrow,
select Stand by from the list, and
then click OK.)*
■Close the computer.
■The power lights
blink.
■The screen
clears.
(Continued)

4–4 Power
Default power settings
Allow the system
to initiate
standby.
No action required:
■If the computer is running
on battery power, the system
initiates standby after 10 minutes of
computer inactivity (default setting).
■If the computer is attached to
external power, the system initiates
standby after 25 minutes of
computer inactivity (default setting).
■Power settings and timeouts can be
changed using Power Options in
Windows Control Panel.
✎If the computer is equipped
with an accelerometer (select
models only), the computer
will not initiate standby or
hibernation, and the display
will be turned off.
■The power lights
blink.
■The screen
clears.
Resume from
user-initiated
standby.
Press the power button. ■The power lights
are turned on.
■Yo u r w o r k
returns to the
screen.
*If you have been registered to a network domain, the button you click will be
called Shut Down instead of Turn Off Computer.
Task Procedure Result

Default power settings
Power 4–5
Initiating or restoring from hibernation
Hibernation cannot be initiated unless it is enabled. Hibernation
is enabled by default.
To verify that hibernation remains enabled:
»Select Start > Control Panel > Performance and
Maintenance > Power Options > Hibernate tab.
If hibernation is enabled, the Enable hibernation check box
is selected.
Task Procedure Result
Initiate
hibernation.
■In Windows XP Home, select
Start > Turn Off Computer.
Then, hold down the shift key
as you select Hibernate.
■In Windows XP Professional,
select Start > Turn Off
Computer. Then, hold down
the shift key as you select
Hibernate. (If hibernate is not
displayed, press the up or
down arrow, select Hibernate
from the list, and then
click OK.)*
■The power lights are
turned off.
■The screen clears.
(Continued)