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Document ID: BMOE-42JQBD

TP 390,1720 - Power management features

Applicable to: World-Wide

Power Management Features
Three power management modes are available in the computer system to reduce power consumption and to prolong battery life.

Standby Mode: In standby mode, the following occurs:

• The LCD backlight turns off.
• The hard disk drive motor stops.
• The audio amplifier turns off. (Fn+F3)

Events that cause the computer to enter standby mode:

• Standby mode requested by the Fn key (Fn+F3).

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

Suspend Mode: In suspend mode, the following occurs:

• The LCD is powered off.
• The hard disk drive is powered off.
• The CPU stops.

Events that cause the computer to enter suspend mode:

• Suspend mode requested by the Fn key (Fn+F4).
• The Lid is closed.
• The specified time has elapsed.
• Battery low occurs and hibernation conditions are insufficient.

• The computer is ejected from the ThinkPad Port Replicator with Advanced Etherjet Feature.
• The UltraBay FX (Combobay) switch is pressed.

Notes:
1. In the IBM BIOS Setup Utility, the computer can be set to suspend when lid is closed.
2. In the IBM BIOS Setup Utility, the computer can be set to suspend when docked.

The following events cause the computer to resume operation from suspend mode:

• The Lid is opened.
• The real time clock alarm is signaled.
• The ring indicator (RI) is signaled by a serial device or a PC Card device.
• The Fn key is pressed.
• Wake on LAN occurs.
• Power switch is pressed.

The computer also exits suspend mode when timer conditions are satisfied for entering hibernation mode.

Hibernation Mode:

For Windows NT or OS/2 user:
A Windows NT or OS/2 user cannot create a hibernation file in a Windows NT or OS/2 system that uses the NTFS/HPFS format system. If you want to use hibernation mode, you should reinstall Windows NT with a FAT format system. Also, if boot manager is installed, the computer cannot enter hibernation mode.

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.

Notes:
1. In the ThinkPad Configuration program, the computer can be set to suspend when docked.
2. The computer cannot enter hibernation mode when it is attached to the ThinkPad Port Replicator with Advanced Etherjet Feature.

Events that cause the computer to enter hibernation mode:

• Hibernation mode requested by function key (Fn+F12).
• Timer conditions are satisfied in suspend mode when hibernate by timer is enabled.
• A critically low battery condition occurs.
• The power switch is pressed. (BIOS Setup)

The compute exits hibernation mode and resumes operation when the power-on switch is pressed. When power is turned on, the hibernation file in the boot record on the hard disk drive is read and the system status is restored from the hard disk drive.

The following events cause the computer to resume operation from hibernation mode.

• The power switch is pressed.
• The real time clock alarm is signaled.
• Wake on LAN occurs.

How to Create the Hibernation Function: Do as follows:

• Turn off the computer.
• Insert the hibernation utility diskette into the diskette drive (you can create the diskette using the Diskette Factory).
• Turn on the computer.
• Follow the instructions on the screen.

Note: If you change the memory size, you need to recreate the hibernation file or partition. For partition-based hibernation, use the hibernation utility to delete the partition first before creating a new one.

	Search Keywords
	Hint Category	Power Management
	Date Created	24-11-98
	Last Updated	29-01-99
	Revision Date	29-01-2000
	Brand	IBM ThinkPad
	Product Family	ThinkPad 390, ThinkPad i Series 172x
	Machine Type	2626, 2627
	Model	Various
	TypeModel
	Retain Tip (if applicable)
	Reverse Doclinks and Admin Purposes