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Document ID: DJON-3LWMUU

TP 770 - Power Management Features

Applicable to: World-Wide

Three power management modes are provided by the computer to reduce power consumption and prolong battery power.

Standby Mode
In standby mode the following occurs:
- The LCD backlight turns off.
- The hard disk motor stops.

Events that cause the computer to enter standby mode:
- Standby is requested by the Fn key (Fn+F3).
- There has been no activity and auto-standby was set in the ThinkPad Configuration program.

The computer exits standby mode and resumes operation when any key is pressed.

Suspend Mode
In suspend mode, the following occurs, in addition to standby mode:
- The LCD is powered off.
- The hard disk is powered off.
- The CPU stops.

Events that cause the computer to enter suspend mode:
- Suspend mode is requested by the Fn key (Fn+F4).
- The LCD is closed.
- The specified time has elapsed from the last operation with the keyboard, mouse, hard disk drive, parallel connector, or diskette drive; or the AC Adapter is plugged in. The time is specified by Suspend Timer in the ThinkPad Configuration program.
- The battery condition is low. The battery power indicator blinks orange. In the ThinkPad Configuration program, the computer can be set to Hibernate when the battery becomes low. The default setting is suspend.
- Either the PS2 OFF or PS2 SUSpend command is set in the ThinkPad Configuration program.

Notes:
1. In the ThinkPad Configuration program, the computer can be set to Will not suspend even if LCD is closed.
2. In the ThinkPad Configuration program, the computer can be set to suspend/hibernate while docked.
3. When the computer is powered with AC power and is used with one of the communication PC Cards, the computer enters standby mode; the PC Card and application program remain active.
4. While the computer is attached to a Dock I, the computer cannot enter suspend mode.
5. The computer does not enter suspend mode when the eject lever of the UltraBay II pops out.

Events that cause the computer to resume operation from suspend mode:
- The LCD is opened.
- The real time clock alarm is signaled.
- The ring indicator (RI) is signaled by a serial or PCMCIA device.
- The Fn key is pressed.
- An external keyboard key is pressed while the computer is connected to AC power.
- Computer also exits suspend mode when timer conditions are satisfied for entering hibernation mode.

Hibernation Mode
For the Windows NT User:
Windows NT users cannot create a hibernation file in a system that uses the NTFS format system (the default format). If you want to use hibernation mode, you should reinstall Windows NT with a FAT format system.

Note: Before using hibernation mode, you need a hibernation file.

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:
- Hibernation mode is requested by the Fn key (Fn+F12).
- Timer conditions are satisfied in suspend mode.
- A critically low battery condition occurs.

Notes:
1. In the ThinkPad Configuration program, the computer can be set to suspend/hibernate while docked.
2. The computer cannot enter hibernation mode when:
- It is powered with AC power and a communication PC Card is used.
- It is attached to a Dock I.
- When the eject lever of the UltraBay II pops out.
- The PS2 HIBernation command is set in the ThinkPad Configuration program.

The computer exits hibernation mode and resumes operation when the power-on switch is turned on.

When power is turned on, the hibernation history in the boot record on the hard disk is recognized and system status is restored from the hard disk to resume operation.

	Search Keywords
	Hint Category	Hardware Maintenance Information, Power
	Date Created	14-09-97
	Last Updated	06-05-98
	Revision Date	28-04-99
	Brand	IBM ThinkPad
	Product Family	ThinkPad 770
	Machine Type	9548, 9549
	Model	All
	TypeModel
	Retain Tip (if applicable)
	Reverse Doclinks and Admin Purposes