Power Management User Guide
© Copyright 2008 Hewlett-Packard Development Company, L.P. Microsoft and Windows are U.S. registered trademarks of Microsoft Corporation. Bluetooth is a trademark owned by its proprietor and used by Hewlett-Packard Company under license. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services.
Table of contents 1 Power control and light locations 2 Power sources Connecting the AC adapter .................................................................................................................. 4 3 Standby and hibernation Standby ................................................................................................................................................ 5 Hibernation .........................................................................................................
Low-battery condition ........................................................................................ 21 Critical low-battery condition ............................................................................. 21 Resolving low-battery conditions ....................................................................................... 22 When external power is available ..................................................................... 22 When a charged battery is available ....................
1 Power control and light locations The following illustration and table identify and describe the power control and light locations. NOTE: (1) Your computer may look slightly different from the illustration in this chapter. Component Description Power button ● When the computer is off, press the button to turn on the computer. ● When the computer is on, press the button to initiate hibernation. ● When the computer is in standby, press the button briefly to exit standby.
(4) Component Description Battery light On: A battery is charging. Blinking: A battery that is the only available power source has reached a low-battery condition or a critical low-battery condition. Off: If the computer is plugged into an external power source, the light turns 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.
2 Power sources The computer runs on internal or external AC power. The following table indicates the best power sources for common tasks. 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.
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) 3pin outlet.
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. Standby CAUTION: 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.
Hibernation CAUTION: 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 connect the computer to or disconnect the computer from an optional docking device or expansion product. Do not add or remove memory modules. Do not insert or remove any hard drives or optical drives. Do not connect or disconnect external devices. Do not insert or remove external media cards.
Initiating standby, hibernation or shutdown The following sections explain when to initiate standby or hibernation and when to shut down the computer. NOTE: You cannot initiate any type of networking connection 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.
When using wireless communication, or readable or writable media CAUTION: To prevent possible audio and video degradation, loss of audio or video playback functionality, or loss of information, do not initiate standby or hibernation while reading from or writing to a disc or an external media card. Standby and hibernation interfere with the use of Bluetooth® and WLAN communication, and media.
4 Power settings This section explains standby, hibernation, and shutdown procedures. Turning the computer or display on or off Task Procedure Result Turn on the computer. Press the power button. ● The power lights turn on. ● The operating system loads. ● The power lights turn off. ● The operating system shuts down. ● The computer turns off. Shut down the computer.* Turn off the display while the power is on. 1. Save your work and close all open applications. 2.
Initiating or resuming from standby Task Procedure Result Initiate standby. ● With the computer on, press fn+f5. ● The power lights blink. ● Select Start > Turn Off Computer > Stand by.* ● The screen clears. No action required. ● The power lights blink. ● If the computer is running on battery power, the system initiates standby after 10 minutes of computer inactivity (default setting). ● The screen clears.
Initiating or restoring from hibernation Hibernation cannot be initiated unless it is enabled. Hibernation is enabled by default. To be sure 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. ● The power lights turn off. – or – ● The screen clears. ● The power lights turn off.
5 Power options You can change many of the power settings using Windows Control Panel. For example, you can set an audio alert to warn you when the battery reaches a low-power condition, or you can change the factory settings for the power button. 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.
Displaying the Power Meter icon By default, the Power Meter icon appears in the notification area, at the far right of the taskbar, displaying different icons to indicate whether the computer is running on battery or external power. To remove the Power Meter icon from the notification area, follow these steps: 1. Right-click the Power Meter icon in the notification area, and then click Adjust Power Properties. 2. Click the Advanced tab. 3. Clear the Always show icon on the taskbar check box. 4.
Setting or changing a power scheme The Power Schemes tab in the Power Options Properties dialog box assigns power levels to system components. You can assign different schemes, depending on whether the computer is running on battery or external power. You can also set a power scheme that initiates standby or turns off the display or hard drive after a time interval that you specify. To set a power scheme: 14 1.
Setting a security prompt You can add a security feature that prompts you for a password when the computer is turned on, resumes from standby, or restores from hibernation. To set a password prompt: 1. Right-click the Power Meter icon in the notification area, and then click Adjust Power Properties. 2. Click the Advanced tab. 3. Select the Prompt for password when computer resumes from standby check box. 4. Click Apply.
6 Processor performance controls CAUTION: To reduce the possibility of heat-related injuries or of overheating the computer, do not place the computer directly on your lap or obstruct the computer air vents. Use the computer only on a hard, flat surface. Do not allow another hard surface, such as an adjoining optional printer, or a soft surface, such as pillows or rugs or clothing, to block airflow.
7 Batteries 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.
Inserting or removing a battery NOTE: Batteries vary in appearance by model. To insert a battery: 1. Turn the computer upside down on a flat surface, with the battery bay away from you. 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 a battery: CAUTION: Removing a battery that is the sole power source can cause loss of information.
Charging a battery To prolong battery life and optimize the accuracy of battery charge displays: WARNING! Do not charge the computer battery while you are onboard aircraft. ● ● To charge a new battery: ◦ Charge the battery while the computer is plugged into external power through the AC adapter. ◦ When you charge the battery, charge it fully before turning on the computer.
Viewing charge displays To view information about the status of any battery in the computer, follow either of these steps: ● Double-click the Power Meter icon in the notification area, at the far right of the taskbar. – or – ● Select Start > Control Panel > Performance and Maintenance > Power Options > Power Meter tab.
Managing low-battery conditions The information in this section describes the alerts and system responses set at the factory. Some lowbattery condition 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 conditions This section explains how to identify low-battery and critical low-battery conditions.
Resolving low-battery conditions CAUTION: To reduce the risk of losing information when the computer reaches a critical low-battery condition and has initiated hibernation, do not restore power until the power lights turn off.
Calibrating a battery When to calibrate Even if a battery is heavily used, it should not be necessary to calibrate it more than once a month. It is not necessary to calibrate a new battery.
Step 2: Discharging the battery Before you begin a full discharge, disable hibernation. To disable hibernation: 1. Select Start > Control Panel > Performance and Maintenance > Power Options > Hibernate tab. 2. Clear the Enable hibernation check box. 3. Click Apply. The computer must remain on while the battery is being discharged. The battery can discharge whether or not you are using the computer but will discharge faster while the computer is in use.
Step 3: Recharging 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 turns off. 3.
Conserving battery power Using the battery conservation procedures and settings described in this section extends the time that a battery can run the computer from a single charge. Conserving power as you work ● Turn off wireless and local area network (LAN) connections and exit modem applications when you are not using them. ● Disconnect external devices that you are not using that are not plugged into an external power source.
Storing a battery 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. 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.
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.
Index A AC adapter 4 B battery battery power vs.
