HP dv8000 - 403809-001 Notebook Laptop Keyboard User manual

Power
Document Part Number: 393525-002
December 2005
This guide explains how the computer uses power.

Power ii
Contents
1 Power controls and lights
2 Power sources
Connecting the AC adapter . . . . . . . . . . . . . . . . . . . . . . . 2–2
3 Standby and hibernation
Standby. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
Hibernation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Initiating standby, hibernation or shutdown. . . . . . . . . . . 3–3
When you leave your work . . . . . . . . . . . . . . . . . . . . 3–3
When a reliable power supply is unavailable . . . . . . 3–4
When using wireless communication or readable or
writable media (select models only) . . . . . . . . . . . . . 3–5
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. . . . . . . . . . . . . . . . . 4–4
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 . . . . . . . . . . . . . . . . . . . . . . . . . 5–4

Contents
Power iii
6 Processor performance controls
7 Battery packs
Inserting or removing a battery pack . . . . . . . . . . . . . . . . 7–2
Charging a battery pack . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4
Monitoring the battery pack charge . . . . . . . . . . . . . . . . . 7–5
Obtaining accurate charge information . . . . . . . . . . . 7–5
Displaying charge information on the screen . . . . . . 7–6
Managing low-battery conditions . . . . . . . . . . . . . . . . . . 7–6
Identifying low-battery conditions . . . . . . . . . . . . . . 7–7
Resolving low-battery conditions . . . . . . . . . . . . . . . 7–8
Calibrating a battery pack . . . . . . . . . . . . . . . . . . . . . . . . 7–9
When to calibrate. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–9
How to calibrate. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–10
Conserving battery power . . . . . . . . . . . . . . . . . . . . . . . 7–13
Conserving power as you work . . . . . . . . . . . . . . . . 7–13
Selecting power conservation settings. . . . . . . . . . . 7–14
Storing a battery pack. . . . . . . . . . . . . . . . . . . . . . . . . . . 7–14
Disposing of a used battery pack . . . . . . . . . . . . . . . . . . 7–14
Index

Power 1–1
1
Power controls and lights
The following illustration and table identify and describe the
power control and light locations.
Component Description
1Display switch Initiates standby if the display is closed
when the computer is on.
2Power lights* (2) On: The computer is on.
Blinking: The computer is in standby.
Off: The computer is off or in
hibernation.
(Continued)

1–2 Power
Power controls and lights
3Power 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.
4fn+f5 Initiates standby.
5Battery light On: A battery pack is charging or is
close to full charge capacity.
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.
Blinking: 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 quickly.
*There are 2 power lights, which 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 even when the computer is closed.
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.
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
❐Optional docking device
❐Optional power adapter
Charge or calibrate a battery
pack in the computer
External power supplied through
■AC adapter
■Optional docking device
■Optional power adapter
Install or modify system
software or write to a CD
or DVD
External power supplied through
■AC adapter
■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.
To connect the computer to external AC power:
1. Plug the AC adapter into the power connector 1on rear panel
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.

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 information
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 such as a Digital
Media Slot card, a PC Card, or an ExpressCard.
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, the password must be entered to restore from hibernation.
ÄCAUTION: To reduce the risk of information loss, save your information
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 when 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. Make
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.

Standby and hibernation
Power 3–3
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 when 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.
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.”

3–4 Power
Standby and hibernation
When a reliable power supply is
unavailable
Make 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, you
take one of the following actions:
■Save your work, and then initiate standby.
■Initiate hibernation.
■Shut down the computer.

Standby and hibernation
Power 3–5
When using wireless communication
or readable or writable media
(select models only)
ÄCAUTION: To prevent possible audio and video degradation, or loss
of audio or video playback functionality, do not initiate standby or
hibernation when 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 infrared and
Bluetooth communication, and media. Note the following
guidelines.
■If the computer is in standby or hibernation, you cannot
initiate an infrared or Bluetooth transmission.
■If standby or hibernation is accidentally initiated during
playback of a medium such as a CD, DVD, or 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 CD or DVD to resume audio
and video playback.

3–6 Power
Standby and hibernation

Power 4–1
4
Default power settings
This section explains the default standby, hibernation, and
shutdown procedures.
The controls and lights discussed in this section are illustrated
in Chapter 1, “Power controls and lights.”

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.
■The operating system
loads.
Shut down the
computer.
Save your work and close all
open applications. Then 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 when the
power is on.
Close the computer. Closing the computer
activates the display
switch, which initiates
standby.

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.

4–4 Power
Default power settings
Initiating or resuming from standby
Task Procedure Result
Initiate standby. ■With the computer on,
press fn+f5.
– or –
■Select Start > Turn Off
Computer > Stand by.
In Windows XP Professional,
if Stand by is not displayed.
1. Press the down arrow.
2. Select Stand by from
the list.
3. Click OK.
– or –
■Close the computer.
■The power lights
blink.
■The screen clears.
Resume from
user-initiated
standby.
■Press the power button.
■If the display was closed when
the computer was in standby,
open the display.
■The power lights are
turned on.
■Your work returns to
the screen.

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.
■Press the power button.
– or –
■Select Start > Turn Off
Computer. Then, hold down
the shift key as you select
Hibernate.
In Windows XP Professional,
if hibernate is not displayed:
1. Press the up or down arrow.
2. Select Hibernate from
the list.
3. Click OK.
■The power lights are
turned off.
■The screen clears.
(Continued)

4–6 Power
Default power settings
Allow the system
to initiate
hibernation (with
hibernation
enabled).
No action required. If the
computer is running on battery
power, the system initiates
hibernation
■After 30 minutes of computer
inactivity.
■When the battery pack(s)
reach a critical low-battery
condition.
✎Power settings and
timeouts can be changed
using Power Options in
Windows Control Panel.
■The power lights are
turned off.
■The screen clears.
Restore from
user-initiated or
system-initiated
hibernation.
Press the power button.†■The power lights are
turned on.
■Your work returns to
the screen.
†If the system initiated hibernation because of a critical low-battery condition,
connect external power or insert a charged battery pack before you press the
power button.
Task Procedure Result

Power 5–1
5
Power options
You can change many default power settings in Windows Control
Panel. For example, you can set an audio alert to warn you when
the battery pack reaches a low-power condition, or you can
change the default settings for the power button.
By default, when the computer is on:
■Pressing fn+f5, called the “sleep button” by the operating
system, initiates standby.
■By default, the display switch turns off the display and
initiates standby. The display switch is activated by closing
the display.
Accessing Power Options Properties
To access Power Options Properties:
■Right-click the Power Meter icon in the notification area,
at the far right of the taskbar, and then click Adjust Power
Properties.
– or –
■Select Start > Control Panel > Performance and
Maintenance > Power Options.