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Power Management
User Guide
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© 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. Nothing herein should be construed as constituting an
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Table of contents 1 Power control and light locations 2 Power sources Connecting the AC adapter .................................................................................................................. 4 3 Standby and hibernation Standby ................................................................................................................................................ 5 Hibernation ...........................................................................................
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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 ........
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1 Power control and light locations The following illustration and table identify and describe the power control and light locations. NOTE: Your computer may look slightly different from the illustration in this chapter. Component Description (1) 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. When the computer is in
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Component Description (4) 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. (5) Internal display switch (s
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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. Task Recommended power source Work in most software applications Charged battery in the computer ● External power supplied through one of the following ● devices: AC adapter incl
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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
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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 c
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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. Hibernation saves your wor
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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.
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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. Note the following guidelines: ● If the computer is in standby or hibernation, you cannot initiate a Blu
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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 Press the power button. ● The power lights turn on. computer. ● The operating system loads. Shut down the 1. Save your work and close all open The power lights turn off. ● computer.* applications. The operating system shuts down. ● 2. Shut down the computer through the The computer turns off. operating system by selecting Start > ● Turn
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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 > ● The screen clears. Stand by.* In Windows XP Professional, if Stand by is not displayed: a. Click the down arrow. b. Select Stand by from the list. c. Click OK. Allow the system to No action required. The power lights blink. ● initiate standby. If the computer is running on battery The screen clears. ● ● power, the system
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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. ● Select Start > Turn Off Compute
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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. – or – ● Select Start > Control Panel > Perform
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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.
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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: 1. Right-click the Power Meter icon in the notification area, and then click Adjust Power P
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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. Setting a security prompt 15
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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. Also, do not allow the AC adapter to contact the skin or a soft surface, such as pillows or rugs
