Maintenance & Service Guide
Presario 1600 Series Portable Computers
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Power Management
Models and
Features
Rear
Connectors
Port
Replicator
Power
Management
The following power management features are available for conserving AC power and extending battery operating time:
■Advanced Power Management (APM)
■Power Management Settings
■Sleep
■Hibernation
■Battery Operating Time
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
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
| Power Management Mode |
| ||
Power | Settings | Maximum | Maximum | Disabled |
Savings |
| Power | Performance |
|
|
| Savings |
|
|
Idle Mode* | Off, On, | On | Off | Off |
| (Auto) |
|
|
|
Sleep Timeout Off, 5, (10), | 5 Minutes | 60 Minutes | Off | |
| 15, 20, 30, |
|
|
|
| 40, 60 |
|
|
|
| Minutes |
|
|
|
Resume On | (Off), On | (Off), On | (Off), On | (Off), On |
Time |
|
|
|
|
Resume Time | (00:00:00) | (00:00:00) | (00:00:00) | (00:00:00) |
Hard Disk | Disabled, 1, | 1 Minute | 15 Minutes | Disabled |
Timeout | 2, 4, (5), 6, |
|
|
|
| 8, 10, 15 |
|
|
|
BIOS PM on | (Off), On | (Off), On | (Off), On | (Off), On |
AC |
|
|
|
|
(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:
■Places the computer in a lower power state after a selectable period of inactivity. Noticeable to the
■Automatically reduces the amount of power the computer uses.
■The computer is immediately ready for use when any key is pressed.
■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:
■Saves all current information from memory and saves it to a file on the hard drive.
■Turns off the computer.
■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
Hibernation is initiated by one of the following means:
■Automatically when the battery reaches a low battery level, if preselected.
■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:
■Power conservation settings
■Hardware configuration
■Software applications
■Installed options
■Display brightness
■Hard drive usage
■Power button
■Changes in operating temperature
■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.