HP Hewlett Packard Power Supply Power Management System User Manual

Power Management  
User Guide  
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Product notice  
This user guide describes features that are common to most models. Some features may not be  
available on your computer.  
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Product notice  
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Table of contents  
2 Using external AC power  
3 Using battery power  
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1 Setting power options  
Using power-saving states  
The computer has two power-saving states enabled at the factory: Sleep and Hibernation.  
When Sleep is initiated, the power lights blink and the screen clears. Your work is saved to memory,  
letting you exit Sleep faster than exiting Hibernation. If the computer is in the Sleep state for an extended  
period or if the battery reaches a critical battery level while in the Sleep state, the computer initiates  
Hibernation.  
When Hibernation is initiated, your work is saved to a hibernation file on the hard drive and the computer  
turns off.  
CAUTION: To prevent possible audio and video degradation, loss of audio or video playback  
functionality, or loss of information, do not initiate Sleep or Hibernation while reading from or writing to  
a disc or an external media card.  
NOTE: You cannot initiate any type of networking connection or perform any computer functions while  
the computer is in the Sleep state or in Hibernation.  
Initiating and exiting Sleep  
The system is set at the factory to initiate Sleep after 10 minutes of inactivity when running on battery  
power and 25 minutes of inactivity when running on external power.  
Power settings and timeouts can be changed using Power Options in Windows® Control Panel.  
With the computer on, you can initiate Sleep in any of the following ways:  
Briefly press the power button.  
Close the display.  
Click Start, and then click the Power button.  
Click Start, click the arrow next to the Lock button, and then click Sleep.  
You can exit Sleep in any of the following ways:  
Briefly press the power button.  
If the display is closed, open the display.  
Press a key on the keyboard or button on the remote control (select models only).  
Activate the TouchPad.  
Using power-saving states  
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When the computer exits Sleep, the power lights turn on and your work returns to the screen where you  
stopped working.  
NOTE: If you have set a password to be required on wakeup, you must enter your Windows password  
before your work will return to the screen.  
Initiating and exiting Hibernation  
The system is set at the factory to initiate Hibernation after 120 minutes (2 hours) of inactivity when  
running on battery power, 1,080 minutes (18 hours) of inactivity when running on external power, or  
when the battery reaches a critical battery level.  
Power settings and timeouts can be changed using Power Options in Windows Control Panel.  
To initiate Hibernation:  
Press fn+f5.  
– or –  
Click Start, click the arrow next to the Lock button, and then click Hibernate.  
To exit Hibernation:  
Briefly press the power button.  
The power lights turn on and your work returns to the screen where you stopped working.  
NOTE: If you have set a password to be required on wakeup, you must enter your Windows password  
before your work will return to the screen.  
2
Chapter 1 Setting power options  
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Using the battery meter  
The battery meter is located in the notification area, at the far right of the taskbar. The battery meter  
allows you to quickly access power settings, view remaining battery charge, and select a different power  
plan.  
To display the percentage of remaining battery charge and the current power plan, move the pointer  
over the battery meter icon.  
To access Power Options, or to change the power plan, click the battery meter icon and select an  
item from the list.  
Different battery meter icons indicate whether the computer is running on battery or external power. The  
icon also displays a message if the battery has reached a critical battery level.  
To hide or display the battery meter icon:  
1. Right-click the taskbar, and then click Properties.  
2. Click the Notification Area tab.  
3. Under System icons, clear the Power check box to hide the battery meter icon, or select the  
Power check box to display the battery meter icon.  
4. Click OK.  
Using the battery meter  
3
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Using power plans  
A power plan is a collection of system settings that manages how the computer uses power. Power  
plans can help you conserve power or maximize performance.  
You can change power plan settings or create your own power plan.  
Viewing the current power plan  
Move the pointer over the battery meter icon in the notification area, at the far right of the taskbar.  
– or –  
Select Start > Control Panel > System and Maintenance > Power Options.  
Selecting a different power plan  
Click the battery meter icon in the notification area, and then select a power plan from the list.  
– or –  
Select Start > Control Panel > System and Maintenance > Power Options, and then select a  
power plan from the list.  
Customizing power plans  
1. Click the battery meter icon in the notification area and then click More power options.  
– or –  
Select Start > Control Panel > System and Maintenance > Power Options.  
2. Select a power plan, and then click Change plan settings.  
3. Change the Turn off the display and Put the computer to sleep timeout settings, as needed.  
4. To change additional settings, click Change advanced power settings and make your changes.  
4
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Setting password protection on wakeup  
To set the computer to prompt for a password when the computer exits Sleep or Hibernation, follow  
these steps:  
1. Select Start > Control Panel > System and Maintenance > Power Options.  
2. In the left pane, click Require a password on wakeup.  
3. Click Change Settings that are currently unavailable.  
NOTE: If prompted by User Account Control, click Continue.  
4. Click Require a password (recommended).  
NOTE: If you need to create a user account password or change your current user account  
password, click Create or change your user account password, and then follow the on-screen  
instructions. If you do not need to create or change a user account password, go to step 5.  
5. Click Save changes.  
Setting password protection on wakeup  
5
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2 Using external AC power  
External AC power is supplied through one of the following devices:  
WARNING! To reduce potential safety issues, use only the AC adapter provided with the computer,  
a replacement AC adapter provided by HP, or a compatible AC adapter purchased from HP.  
Approved AC adapter  
Optional docking device or expansion product  
Connect the computer to external AC power under any of the following conditions:  
WARNING! Do not charge the computer battery while you are onboard aircraft.  
When you are charging or calibrating a battery  
When you are installing or modifying system software  
When you are writing information to a CD or DVD  
When you connect the computer to external AC power, the following events occur:  
The battery begins to charge.  
If the computer is turned on, the battery meter icon in the notification area changes appearance.  
When you disconnect external AC power, the following events occur:  
The computer switches to battery power.  
The display brightness is automatically decreased to save battery life. To increase display  
brightness, press the fn+f8 hotkey or reconnect the AC adapter.  
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Chapter 2 Using external AC power  
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Connecting the AC adapter  
WARNING! 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.  
To connect the computer to external AC power:  
1. Plug the AC adapter into the power connector (1) on 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).  
Connecting the AC adapter  
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3 Using battery power  
When a charged battery is in the computer and the computer is not plugged into external power, the  
computer runs on battery power. When the computer is plugged into external AC power, the computer  
runs on AC power.  
If the computer contains a charged battery and is running on external AC power supplied through the  
AC adapter, the computer switches to battery power if the AC adapter is disconnected from the  
computer.  
NOTE: The display brightness is decreased to save battery life when you disconnect AC power. To  
increase display brightness, use the fn+f8 hotkey or reconnect the AC adapter.  
You can keep a battery in the computer or in storage, depending on how you work. Keeping the battery  
in the computer whenever the computer is plugged into AC power charges the battery and also protects  
your work in case of a power outage. However, a battery in the computer slowly discharges when the  
computer is off and unplugged from external power.  
WARNING! To reduce potential safety issues, use only the battery provided with the computer, a  
replacement battery provided by HP, or a compatible battery purchased from HP.  
Computer battery life varies, depending on power management settings, programs running on the  
computer, display brightness, external devices connected to the computer, and other factors.  
8
Chapter 3 Using battery power  
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Finding battery information in Help and Support  
The Battery information section of the Help and Support Learning Center provides the following tools  
and information:  
Battery Check tool to test battery performance  
Information on calibration, power management, and proper care and storage to maximize battery  
life  
Information on battery types, specifications, life cycles, and capacity  
To access Battery information:  
Select Start > Help and Support > Learning Center > Battery information.  
Finding battery information in Help and Support  
9
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Using Battery Check  
Battery Check, a part of the Total Care Advisor, provides information on the status of the battery installed  
in the computer.  
To run Battery Check:  
1. Connect the AC adapter to the computer.  
NOTE: The computer must be connected to external power for Battery Check to function properly.  
2. Select Start > Help and Support > Troubleshooting tools > Battery Check.  
Battery Check examines the battery and its cells to see if they are functioning properly, and then reports  
the results of the examination.  
10 Chapter 3 Using battery power  
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Displaying the remaining battery charge  
Move the pointer over the battery meter icon in the notification area, at the far right of the taskbar.  
– or –  
View the estimated number of minutes of battery charge remaining in Windows Mobility Center:  
Click the battery meter icon, and then click Windows Mobility Center.  
– or –  
Select Start > Control Panel > Mobile PC > Windows Mobility Center.  
The time shown indicates the approximate running time remaining on the battery if the battery  
continues to provide power at the current level. For example, the time remaining will decrease  
when a DVD is playing and will increase when a DVD stops playing.  
Displaying the remaining battery charge 11  
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Inserting or removing the battery  
CAUTION: Removing a battery that is the sole power source can cause loss of information. To prevent  
loss of information, initiate Hibernation or shut down the computer through Windows before removing  
the battery.  
To insert the battery:  
1. Turn the computer upside down on a flat surface.  
2. Insert the battery into the battery bay (1) and rotate it downward until it is seated (2).  
The battery release latch (3) automatically locks the battery into place.  
To remove the battery:  
1. Turn the computer upside down on a flat surface.  
2. Slide the battery release latch (1) to release the battery.  
3. Pivot the battery (2) upward and remove the battery from the computer (3).  
12 Chapter 3 Using battery power  
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Charging a battery  
WARNING! Do not charge the computer battery while you are onboard aircraft.  
The battery charges whenever the computer is plugged into external power through an AC adapter, an  
optional power adapter, an optional expansion product, or an optional docking device.  
The battery charges whether the computer is off or in use, but it charges faster when the computer is  
off.  
Charging may take longer if a battery is new, has been unused for 2 weeks or more, or is much warmer  
or cooler than room temperature.  
To prolong battery life and optimize the accuracy of battery charge displays, follow these  
recommendations:  
If you are charging a new battery, charge it fully before turning on the computer.  
Charge the battery until the battery light turns off.  
NOTE: If the computer is on while the battery is charging, the battery meter in the notification  
area may show 100 percent charge before the battery is fully charged.  
Allow the battery to discharge below 5 percent of a full charge through normal use before charging  
it.  
If the battery has been unused for one month or more, calibrate the battery instead of simply  
charging it.  
The battery light displays charge status:  
On: The battery is charging.  
Blinking: The battery has reached a low battery level or critical battery level and is not charging.  
Off: The battery is fully charged, in use, or not installed.  
Charging a battery 13  
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Maximizing battery discharge time  
Battery discharge time varies depending on the features you use while on battery power. Maximum  
discharge time gradually shortens, as the battery storage capacity naturally degrades.  
Tips for maximizing battery discharge time:  
Lower the brightness on the display.  
Check the Power saver setting in Power Options.  
Remove the battery from the computer when it is not being used or charged.  
Store the battery in a cool, dry location.  
14 Chapter 3 Using battery power  
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Managing low battery levels  
The information in this section describes the alerts and system responses set at the factory. Some low-  
battery alerts and system responses can be changed using Power Options in Windows Control Panel.  
Preferences set using Power Options do not affect lights.  
Identifying low battery levels  
When a battery that is the sole power source for the computer reaches a low battery level, the battery  
light blinks.  
If a low battery level is not resolved, the computer enters a critical battery level, and the battery light  
continues to blink.  
The computer takes the following actions for a critical battery level:  
If Hibernation is enabled and the computer is on or in the Sleep state, the computer initiates  
Hibernation.  
If Hibernation is disabled and the computer is on or in the Sleep state, the computer remains briefly  
in the Sleep state, and then shuts down and loses any unsaved information.  
Managing low battery levels 15  
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Resolving a low battery level  
CAUTION: To reduce the risk of losing information when the computer reaches a critical battery level  
and has initiated Hibernation, do not restore power until the power lights turn off.  
Resolving a low battery level when external power is available  
Connect one of the following devices:  
AC adapter  
Optional expansion product or docking device  
Optional power adapter  
Resolving a low battery level when a charged battery is available  
1. Turn off the computer or initiate Hibernation.  
2. Remove the discharged battery, and then insert a charged battery.  
3. Turn on the computer.  
Resolving a low battery level when no power source is available  
Initiate Hibernation.  
– or –  
Save your work and shut down the computer.  
Resolving a low battery level when the computer cannot exit Hibernation  
When the computer lacks sufficient power to exit Hibernation, follow these steps:  
1. Insert a charged battery or plug the computer into external power.  
2. Exit Hibernation by pressing the power button.  
16 Chapter 3 Using battery power  
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Calibrating a battery  
Calibrate a battery under the following conditions:  
When battery charge displays seem inaccurate  
When you observe a significant change in battery run time  
Even if a battery is heavily used, it should not need to be calibrated more than once a month. It is also  
not necessary to calibrate a new battery.  
Step 1: Fully charge the battery  
WARNING! Do not charge the computer battery while you are onboard aircraft.  
NOTE: The battery charges whether the computer is off or in use, but it charges faster when the  
computer is off.  
To fully charge the battery:  
1. Insert the battery into the computer.  
2. Connect the computer to an AC adapter, optional power adapter, optional expansion product, or  
optional docking device, and then plug the adapter or device into external power.  
The battery light on the computer turns on.  
3. Leave the computer plugged into external power until the battery is fully charged.  
The battery light on the computer turns off.  
Step 2: Disable Hibernation and Sleep  
1. Click the battery meter icon in the notification area, and then click More power options.  
– or –  
Select Start > Control Panel > System and Maintenance > Power Options.  
2. Under the current power plan, click Change plan settings.  
3. Record the Turn off the display and Put the computer to sleep settings listed in the On  
battery column so that you can reset them after the calibration.  
4. Change the Turn off the display and Put the computer to sleep settings to Never.  
5. Click Change advanced power settings.  
6. Click the plus sign next to Sleep, and then click the plus sign next to Hibernate after.  
7. Record the On battery setting under Hibernate after so that you can reset it after the calibration.  
8. Change the On battery setting to Never.  
9. Click OK.  
10. Click Save changes.  
Calibrating a battery 17  
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Step 3: Discharge the battery  
The computer must remain on while the battery is being discharged. The battery can discharge whether  
or not you are using the computer, but the battery will discharge faster while you are using it.  
If you plan to leave the computer unattended during the discharge, save your information before  
beginning the discharge procedure.  
If you use the computer occasionally during the discharge procedure and have set energy-saving  
timeouts, expect the following performance from the system during the discharge process:  
The monitor will not turn off automatically.  
Hard drive speed will not decrease automatically when the computer is idle.  
System-initiated Hibernation will not occur.  
To discharge a battery:  
1. Unplug the computer from its external power source, but do not turn off the computer.  
2. Run the computer on battery power until the battery is discharged. The battery light begins to blink  
when the battery has discharged to a low battery level. When the battery is discharged, the battery  
light turns off and the computer shuts down.  
18 Chapter 3 Using battery power  
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Step 4: Fully recharge the battery  
To recharge the battery:  
1. Plug the computer into external power and maintain external power until the battery is fully  
recharged. When the battery is recharged, the battery light on the computer turns off.  
You can use the computer while the battery is recharging, but the battery will charge faster if the  
computer is off.  
2. If the computer is off, turn it on when the battery is fully charged and the battery light has turned  
off.  
Step 5: Reenable Hibernation and Sleep  
CAUTION: Failure to reenable Hibernation after calibration may result in a full battery discharge and  
information loss if the computer reaches a critical battery level.  
1. Click the battery meter icon in the notification area, and then click More power options.  
– or –  
Select Start > Control Panel > System and Maintenance > Power Options.  
2. Under the current power plan, click Change plan settings.  
3. Reenter the settings that you recorded for the items in the On battery column.  
4. Click Change advanced power settings.  
5. Click the plus sign next to Sleep, and then click the plus sign next to Hibernate after.  
6. Reenter the setting that you recorded for On battery.  
7. Click OK.  
8. Click Save changes.  
Calibrating a battery 19  
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Conserving battery power  
Select low power-use settings through Power Options in Windows Control Panel.  
Turn off wireless and local area network (LAN) connections and exit modem applications when you  
are not using them.  
Disconnect external devices that are not plugged into an external power source, when you are not  
using them.  
Stop, disable, or remove any external media cards that you are not using.  
Use the fn+f7 and fn+f8 hotkeys to adjust screen brightness as needed.  
If you leave your work, initiate Sleep or Hibernation, or shut down the computer.  
20 Chapter 3 Using battery power  
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Storing a battery  
CAUTION: To prevent damage to a battery, do not expose it to high temperatures for extended periods  
of time.  
If a computer will be unused and unplugged from external power for more than 2 weeks, remove the  
battery and store it separately.  
To prolong the charge of a stored battery, place it in a cool, dry place.  
NOTE: A stored battery should be checked every 6 months. If the capacity is less than 50 percent,  
recharge the battery before returning it to storage.  
Calibrate a battery before using it if it has been stored for one month or more.  
Storing a battery 21  
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Disposing of a used battery  
WARNING! To reduce the risk of fire or burns, do not disassemble, crush, or puncture a battery; short  
the external contacts on a battery; or dispose of a battery in fire or water. Do not expose a battery to  
temperatures above 60˚C (140˚F). Replace the battery only with a battery approved for this computer.  
Refer to the Regulatory, Safety and Environmental Notices for battery disposal information.  
22 Chapter 3 Using battery power  
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Replacing the battery  
Computer battery life varies, depending on power management settings, programs running on the  
computer, display brightness, external devices connected to the computer, and other factors.  
Battery Check notifies you to replace the battery when an internal cell is not charging properly, or when  
the battery storage capacity has reached a ”weak” condition. A message refers you to the HP Web site  
for more information about ordering a replacement battery. If the battery is possibly covered by an HP  
warranty, instructions include a warranty ID.  
NOTE: To ensure that you always have battery power when you need it, HP recommends purchasing  
a new battery when the storage capacity indicator turns green-yellow.  
Replacing the battery 23  
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4 Shutting down the computer  
CAUTION: Unsaved information will be lost when the computer is shut down.  
The Shut Down command closes all open programs, including the operating system, and then turns off  
the display and computer.  
Shut down the computer under any of the following conditions:  
When you need to replace the battery or access components inside the computer  
When you are connecting an external hardware device that does not connect to a USB port  
When the computer will be unused and disconnected from external power for an extended period  
To shut down the computer, follow these steps:  
NOTE: If the computer is in the Sleep state or in Hibernation, you must first exit Sleep or Hibernation  
before shutdown is possible.  
1. Save your work and close all open programs.  
2. Click Start, and then click the arrow next to the Lock button.  
3. Click Shut Down.  
If the computer is unresponsive and you are unable to use the preceding shutdown procedures, try the  
following emergency procedures in the sequence provided:  
Press ctrl+alt+delete, and then click the Power button.  
Press and hold the power button for at least 5 seconds.  
Disconnect the computer from external power and remove the battery.  
24 Chapter 4 Shutting down the computer  
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Index  
A
L
AC adapter, connecting  
low battery level 15  
B
O
battery  
operating system 24  
calibrating 17  
charging 13, 17  
conserving power 20  
discharging 14  
disposing 22  
inserting 12  
low battery levels 15  
recharging 19  
removing 12  
replacing 23  
storing 21  
P
power  
connecting  
conserving 20  
R
readable media  
S
shutdown 24  
shutting down 24  
Sleep  
Battery Check 10  
battery light 13, 15  
exiting  
battery power  
initiating  
battery release latch 12  
battery temperature 21  
storing battery 21  
T
C
temperature 21  
calibrating battery 17  
traveling with the computer 21  
turning off the computer 24  
charging batteries 13, 17  
connection, external power  
conservation, power 20  
critical battery level 15  
U
unresponsive system 24  
D
W
drive media  
writable media  
H
Hibernation  
exiting  
initiated during critical battery  
level 15  
initiating  
Index 25  
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