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Service Hints & Tips |
Document ID: AGRN-42KLT8 |
TP 1400 - Power Management Features
Applicable to: World-Wide
The following information is intended for IBM Dealers and Authorized Servicers only. Customers attempting to follow any of the procedures below may void their warranty.
Power Management Features
Two power management modes are available in the computer system to reduce power consumption and to prolong battery life.
Screen Blanking Mode
When in screen blanking mode, the following occurs:
- The LCD backlight turns off.
Events that cause the computer to enter standby mode:
- Screen blanking requested by the Fn key (Fn+F3).
Standby Mode
When in standby mode, the following occurs:
- The LCD backlight turns off.
- The hard disk motor stops.
- CPU stops the clock.
Events that cause the computer to enter standby mode:
Note: The standby mode indicator turns on when the system is in standby mode.
- Standby requested by the Fn key (Fn+F4).
- The LCD is closed (if the "Will not Enter Standby Even if the Lid is Closed" parameter in the Power Management menu of the BIOS Utility is set to "Disabled").
- The system (keyboard, mouse, hard disk drive, parallel connector, or diskette drive, etc.) is idle for a certain period of time.
- The battery power is critically low. The "Sleep upon Battery-low" in the Power Management menu of the BIOS Utility is set to "Enabled". Sleep Manager is not installed and the hibernation file is not present or invalid.
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Note: Before entering standby mode, if "Battery-low Warning Beep" in the Power Management menu of the BIOS Utility is set to "Enabled", four short beeps will be issued every minute for three minutes. If a powered AC Adapter is not attached, then the beeps will be continuously issued every minute until the system shuts down.
Events that cause the computer to exit standby mode:
- The LCD is opened (if the system entered standby mode from closing the lid).
- A serial or PCMCIA device signals the modem ring indicator (RI).
- Any key or pointing device operation.
Note: If the computer enters standby mode and the com-puter is using a communication or I/O PC Card, the PC Card and application program remain active.
Hibernation Mode
When in hibernation mode, the following occurs:
- The system status, RAM, VRAM, and setup data are stored on the hard disk.
- The system is powered off
Events that cause the computer to enter hibernation mode:
- Function combination key (Fn+F12) is pressed.
- The battery power is at a critically-low level.
Note: Before entering standby mode, if "Battery-low Warning Beep" in the Power Management menu of the BIOS Utility is set to "Enabled", four short beeps will be issued every minute for three minutes.
- The system (keyboard, mouse, hard disk drive, par-allel connector, or diskette drive, etc.) is idle for a certain period of time.
Note: The computer cannot enter hibernation mode when the computer is using a communication or I/O PC Card.
Events that cause the computer to exit hibernation mode:
- The power-on switch is operated.
When power is turned on, the hibernation history in the boot record on the hard disk is recognized and the system status is restored from the hard disk to resume operation.
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Document Category |
Hardware Maintenance Information |
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Date Created |
25-11-98 |
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Last Updated |
25-11-98 |
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Revision Date |
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Brand |
IBM ThinkPad |
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Product Family |
ThinkPad i Series 1400 |
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Machine Type |
2611 |
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Model |
Various |
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TypeModel |
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Retain Tip (if applicable) |
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Reverse Doclinks
and Admin Purposes |
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