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.”