HP Presario 1600 Presario Select 1600 Series Maintenance and Service Guide - Page 86
Power Management - service manual
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Maintenance & Service Guide Presario 1600 Series Portable Computers Notice | Preface | Home | Product Description | Troubleshooting | Illustrated Parts Catalog Removal & Replacement Procedures | Specifications | Connector Pin Assignments | Battery Pack Power Management Models and The following power management features are available for Features conserving AC power and extending battery operating time: Rear Connectors s Advanced Power Management (APM) s Power Management Settings Port Replicator Power s Sleep s Hibernation s Battery Operating Time Management Advanced Power Management (APM) APM is installed on the computer and requires no action from the user to reduce power consumption. APM turns off the processor between keystrokes and when the system is idle. The idle function can be disabled by the user. Power Management Settings You can select power conservation settings through Power Management located on the System Features menu in Computer Setup. Computer Setup can be accessed by pressing F10 when the cursor blinks on the upper-right corner of the display screen during system reboot. These settings control the power conservation rate and the timeout values for various system components. A timeout is a specified period of system or component inactivity. After this period, the system or component (for example, the hard drive) is shut down to conserve power until it is accessed again. There are four categories of power management settings: Maximum Power Saving, Maximum Performance, Customized, and Disabled. The default setting for each feature is listed in Table 1-9. Power Management Mode Power Savings Settings Maximum Power Savings Maximum Performance Disabled Idle Mode* Off, On, On Off Off (Auto) Sleep Timeout Off, 5, (10), 15, 20, 30, 40, 60 Minutes 5 Minutes 60 Minutes Off Resume On (Off), On Time (Off), On (Off), On (Off), On Resume Time (00:00:00) (00:00:00) (00:00:00) (00:00:00) Hard Disk Timeout Disabled, 1, 2, 4, (5), 6, 8, 10, 15 1 Minute 15 Minutes Disabled BIOS PM on (Off), On AC (Off), On (Off), On (Off), On (Defaults) cannot be modified * Idle Mode: Determines processor speed. For Auto, processor is throttled to 50% of maximum clock sped only during inactivity. When On, processor is always at 50% of maximum clock speed. When Off, processor is always at maximum clock speed. Sleep Sleep is a power conservation mode that performs the following functions: s Places the computer in a lower power state after a selectable period of inactivity. Noticeable to the end-user, the panel is powered off and the hard drive is spun down. s Automatically reduces the amount of power the computer uses. s The computer is immediately ready for use when any key is pressed. s Sleep mode is indicated by the Sleep (moon shaped) icon on the Status Panel. The computer may be manually put in Sleep mode by pressing the Fn + F4 keys. Hibernation Hibernation is a power conservation mode that performs the following functions: s Saves all current information from memory and saves it to a file on the hard drive. s Turns off the computer. s Can be restored after any amount of time. The Hibernation file is preinstalled on the hard disk. The Hibernation file is slightly larger than the total RAM memory of the computer (system memory, memory expansion board, and video memory). The Hibernation 100-MB file can be reinstalled with the QuickRestore CD. The system comes configured with a hibernation file large enough to support 96 MB of DRAM. Please refer to C:\HIBERNATE\HELP.TXT to customize the hibernation file size. Hibernation is initiated by one of the following means: s Automatically when the battery reaches a low battery level, if preselected. s Manually by simultaneously pressing the power button. By holding the power button for more than four seconds, the system will power off instead of hibernating. When the Power button is pushed, the computer exits Hibernation. Battery Operating Time Battery operating time is affected by variables, such as the following: s Power conservation settings s Hardware configuration s Software applications s Installed options s Display brightness s Hard drive usage s Power button s Changes in operating temperature s Type and number of installed PC Cards Refer to Appendix B for information on increasing battery pack operating time, conditioning the battery pack, and disposing of a used battery pack.