Power Management Features (2625 365X, XD

^{IBM-AUSTRIA - PC-HW-Support 30 Aug 1999}

Power Management Features (2625 365X, XD - 2635 380-385)

Power Management Features

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

Standby Mode

When 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 requested by the Fn key. (Fn+F3)
No activity under auto-standby enabled by the ThinkPad Features program.

Events that cause the computer to exit or resume standby mode:

(Resume) Any key operation.

Suspend Mode

When in suspend mode, the following, in addition to the three actions of standby mode, occur:

The LCD is powered off.
The hard disk is powered off.
The CPU is stopped.

NOTE:

In the ThinkPad Features Program, the computer can be set to 'Will not suspend even if LCD is closed.'
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.
The computer cannot enter suspend mode while a communication link is running.

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 Features program.
The battery condition is low. The battery power indicator blinks amber.
Either the PS2 OFF or PS2 SUSpend command is set in the ThinkPad Features program.

Events that cause the computer to exit or resume suspend mode:

(Resume) The LCD is opened.
(Resume) The real time clock alarm is signaled.
(Resume) The ring indicator (RI) is signaled by a serial or PCMCIA device.
(Resume) The Fn key is pressed.
(Resume 2625 365x only) An external keyboard key is pressed while operating with ac power.
(Exit) Timer (timeout) conditions are satisfied for entering hibernation mode.

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.

NOTE: The computer cannot enter hibernation mode when the computer is powered with ac power and a communication PC card is used.

Events that cause the computer to enter hibernation mode:

(2625 365x only) The keyboard is opened.
Hibernation mode is requested by the Fn key (Fn+F12).
Timer/timeout conditions are satisfied in suspend mode.
A critical low battery condition occurs.
The PS2 HIB ernation command is set in the ThinkPad Features program.

Event that causes 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 system status is restored from the hard disk to resume operation.

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