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TP General - Using and Understanding IBM ThinkPad Advanced Power Management
Applicable to: World-Wide
How to use and understand ThinkPad Advanced Power Management Modes.
Using the Battery Power-Management Function:
Your computer has the following built-in battery power-saving functions to save power when you use the battery pack or AC Adapter:
Operation modes:
The operation modes control the processor speed or set timers for saving power. For more information about the operation modes, see the ThinkPad Features program on-line help.
Power-saving modes:
The power-saving modes stop all tasks when the computer is not used for a specified time.
When resuming normal operation from one of the modes, use the resume function to return to where you were when you entered that mode. Because the operating system is already loaded, the resume function is faster than turning the power on.
The following are the three power-saving modes:
Standby Mode:
You can enter standby mode for short idle times, such as when you are having a short conversation. In standby mode, the LCD (and external monitor output) turns off. The computer immediately resumes normal operation when you press any key or use any pointing device.
To enter standby mode, press Fn+F3. You can also set the standby timer using the ThinkPad Features program. (To return to normal operation, press any key.)
Suspend Mode:
You can enter suspend mode for somewhat longer times when you are away from your computer. The computer provides the following two types of suspend modes for you to save power:
- Suspend mode
- RediSafe suspend mode
To enter suspend mode, do one of the following:
- Press Fn+F4.
- Close the LCD of the computer.
- Open the keyboard of the computer.
- Set the suspend timer using the ThinkPad Features program.
When the computer is entering suspend mode, the suspend indicator lamp blinks first, and then stays on (in green) with a beep. The power indicator lamp turns off.
To return to normal operation, press the Fn key. In suspend mode, all tasks are stopped and stored in memory to save power. When the computer resumes normal operation, the tasks are automatically restored.
RediSafe suspend mode:
In RediSafe suspend mode, all tasks are stopped, and memory data and the status of the computer are stored on the hard disk drive. This prevents accidental loss of data during suspend mode. Resuming normal operation is faster in RediSafe suspend mode than it is in hibernation mode; the computer resumes normal operation when you press the Fn key in RediSafe suspend mode. If all battery power is used and the computer turns off during RediSafe suspend mode, install a fully charged battery pack or connect the AC Adapter; then press the power switch to resume operation. All tasks are restored. Create the hibernation file before using this mode. (See "Creating the Hibernation File".) Note: all ThinkPads do not support RediSafe mode. Refer to your user's guide to see if yours supports RediSafe.
To enable RediSafe suspend mode, first, create the hibernation file; then set RediSafe suspend in the ThinkPad Features program's Battery menu. For more information, see the ThinkPad Features program online help, or use PS2 commands.
Considerations for Suspend Mode:
Consider the following before using suspend mode:
The computer can enter suspend mode when used with the following operating systems:
- DOS Version 7.0
- OS/2 Warp Version 3 or later
- Microsoft Windows Version 3.11 with DOS Version 7.0
- Microsoft Windows 95
- Microsoft Windows NT version 3.51 or later
Attached devices, such as a printer or serial device, stop running when the computer enters suspend mode. When you resume normal operation, the output might differ from what you expect, because the device might be reset or lose its configuration settings.
Sometimes you might want to use the computer with the LCD closed, for example, when an external monitor and keyboard are used. In such a case, turn on the computer with the LCD closed or set the computer to not enter suspend mode when the LCD is closed using the ThinkPad Features program.
When a power-on password is set and the computer resumes normal operation by the ThinkPad Features timer or an
incoming call, only a blank screen is displayed. To display a power-on password prompt, press any key or move your
pointing device.
When the computer is powered with battery power, the computer turns power off to the PC Card, and communication stops for communication PC Cards, so the duration of suspend mode is longer.
If communication for a PC Card is not re-established after resuming normal operation, remove and then reinstall the PC Card before restarting the system or application program. For other kinds of PC Cards, if the PC Card or computer does not operate, restart the application or computer.
When the computer is attached to the Dock II and the "Suspend/hibernate while docked" option is disabled, the computer enters standby mode instead of suspend mode.
Note:
To disable the "Suspend/hibernate while docked" option, open the ThinkPad Features program and click on the Docking Station option.
The following are the considerations when you use PC Card Director:
When the computer is powered with ac power and is using one of the following IBM PC Cards, it enters standby mode:
- IBM 3270 Emulation Credit Card Adapter
- IBM Token-Ring 16/4 Credit Card Adapter
- IBM Credit Card Adapter for Ethernet
- IBM 5250 Emulation Credit Card Adapter
When other PC Cards are used and the computer enters suspend mode, all application programs stop. Communication also stops for communication PC Cards not in the preceding list. For some PC Cards, power to the PC Cards might also turn off.
When the computer is using one of the following IBM modem cards and detects an incoming call while in suspend mode, the computer automatically resumes normal operation:
- IBM 28.8/14.4 Data/FAX Modem
- IBM PCMCIA Data/FAX Modem
- IBM High Speed PCMCIA Data/FAX Modem
- IBM Microelectronics 2.4/9.6 Data/FAX Modem
- IBM Microelectronics 14.4/14.4 Data/FAX Modem
- IBM Wireless Modem for ARDIS(**)
- IBM Wireless Modem for Mobitex(**)
- IBM Wireless Modem for Cellular/CDPD
Note:
You must set the Resume on incoming call option in the ThinkPad Features program so the computer automatically resumes normal operation.
For OS/2 or Windows:
- Click on the Battery icon.
- Click on the Suspend/Resume option icon; then select the Resume on incoming call option.
For DOS:
- Enter: PS2 RI E
While a communication link is active, the computer does not enter suspend mode.
Hibernation Mode:
You can enter hibernation mode when you leave your office for the day.
It takes more time to return to normal operation from suspend mode than to return from standby mode, but the computer does not use as much power.
The following figure shows the operations required when the computer moves from a power-off condition to operation mode, and vice versa.
In hibernation mode, all tasks are stopped and memory data and the current status of the computer are stored on the hard disk drive; then power is turned off. No battery power is used. When power is turned on again, the computer automatically restores the tasks and resumes normal operation.
Note:
With a base memory of 8 MB it takes approximately 10 seconds to enter hibernation mode and 18 seconds to resume normal operation. (The time to enter or exit hibernation mode depends on the computer memory size.)
To enter hibernation mode, press Fn+F12. To return to normal operation, turn on the power switch.
Before you can use hibernation mode, you must first create a hibernation file. See the next section.
Creating the Hibernation File:
When installing an operating system or installing additional computer memory, you must create a hibernation file on the hard disk drive to use the hibernation mode.
Considerations for Hibernation Mode:
Consider the following before using hibernation mode:
- Using a docking station or a particular PC Card can disable hibernation mode.
- Do not run any tasks while the hibernation file is being created.
The computer uses battery power to enter hibernation mode. Therefore, it reserves some battery power if it is set to enter hibernation mode when a low-battery condition occurs.
When you enter hibernation mode while playing music CDs or multi-session photo CDs, you will not return to where you left off after resuming normal operation.
When the computer is powered with battery power, the computer turns power off to the PC Card when entering hibernation mode. When resuming normal operation, if the PC Card or computer does not operate, restart the application or computer.
Note:
If the communication links are still not re-established, remove and then reinstall the PC Card before restarting the system or application program.
When the computer enters hibernation mode while attached to the docking station, it may not resume correctly.
When the computer is powered with ac power and is using one of the following IBM PC Cards, it does not enter hibernation mode:
- IBM 28.8/14.4 Data/FAX Modem
- IBM PCMCIA Data/FAX Modem
- IBM High Speed PCMCIA Data/FAX Modem
- IBM 3270 Emulation Credit Card Adapter
- IBM Token-Ring 16/4 Credit Card Adapter
- IBM Credit Card Adapter for Ethernet
- IBM 5250 Emulation Credit Card Adapter
- IBM Microelectronics 2.4/9.6 Data/FAX Modem
- IBM Microelectronics 14.4/14.4 Data/FAX Modem
- IBM Wireless Modem for ARDIS
- IBM Wireless Modem for Mobitex
- IBM Wireless Modem for Cellular/CDPD
This prevents possible problems from occurring with communication application programs after the computer returns to
normal operation.
Attention:
The hibernation file must not be created in a compressed data area of the hard disk.
Note:
You can create a hibernation file on the hard disk drive in the main hard disk drive bay.
The size of the hibernation file will be greater than total memory. For example, if base memory is 32 MB and you have installed an optional 16 MB memory module (DIMM), the hibernation file is 49MB: 32 MB + 16 MB + 1 MB = 49 MB
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Hint Category |
Power | |
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Date Created |
10-07-97 | |
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Last Updated |
06-04-99 | |
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Revision Date |
06-04-2000 | |
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Brand |
IBM ThinkPad | |
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Product Family |
ThinkPad 310, ThinkPad 315, ThinkPad 355, ThinkPad 360, ThinkPad 365X/XD, ThinkPad 365C/CS, ThinkPad 365CD/CSD, ThinkPad 365E/ED, ThinkPad 380, ThinkPad 380D, ThinkPad 380E, ThinkPad 380ED, ThinkPad 380XD, ThinkPad 380Z, ThinkPad 385D, ThinkPad 385E, ThinkPad 385ED, ThinkPad 385XD, ThinkPad 390, ThinkPad 390E, ThinkPad 560, ThinkPad 560E, ThinkPad 560X, ThinkPad 560Z, ThinkPad 600, ThinkPad 600E, ThinkPad 701, ThinkPad 750, ThinkPad 755C/CS, ThinkPad 755CE/CSE, ThinkPad 755CX, ThinkPad 755CV, ThinkPad 755CD, ThinkPad 755CDV, ThinkPad 760C, ThinkPad 760E, ThinkPad 760CD, ThinkPad 760L/LD, ThinkPad 760ED, ThinkPad 760XD, ThinkPad 760EL/ELD, ThinkPad 760XL, ThinkPad 765L, ThinkPad 765D, ThinkPad 770, ThinkPad 770E/ED, ThinkPad 770X, ThinkPad 770Z, ThinkPad i Series 1400, ThinkPad i Series 172x | |
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Machine Type |
2600, 2619, 2620, 2625, 2635, 2636, 2626, 2640, 2641, 2645, 2646, 2630, 9545, 9546, 9547, 9548, 9549, 9544, 2611, 2627 | |
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Model |
Various | |
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