Power Management; Screen Blank Mode; Sleep Mode; Hibernation Mode - Lenovo B575e Hardware Maintenance Manual

Power management

Note: Power management modes are not supported for APM operating system.
To reduce power consumption, the computer has three power management modes: screen blank, sleep,
and hibernation.

Screen blank mode

If the time set on the "Turn off monitor" timer in the operating system expires, the LCD backlight turns off.
You also can turn off the LCD backlight by pressing Fn+F2.
To end screen blank mode and resume normal operation, press any key.

Sleep mode

When the computer enters sleep mode, the following events occur in addition to what occurs in screen
blank mode:
• The LCD is powered off.
• The hard disk drive is powered off.
• The CPU stops.
To enter sleep mode, press Fn+F1.
In certain circumstances, the computer goes into sleep mode automatically:
• If a "suspend time" has been set on the timer, and the user does not do any operation with the keyboard,
the hard disk drive, the parallel connector, or the diskette drive within that time.
• If the battery indicator blinks orange, indicating that the battery power is low.
To cause the computer to return from sleep mode and resume the operation, do one of the following:
• Press the Fn key.
• Open the LCD cover.
• Turn on the power button.
Also, when the time set on the resume timer elapses, the computer automatically returns from sleep mode
and resumes operation.
Note: The computer does not accept any input immediately after it enters sleep mode. Wait a few seconds
before taking any action to reenter operation mode.

Hibernation mode

In hibernation mode, the following occurs:
• The system status, RAM, VRAM, and setup data are stored on the hard disk drive.
• The system is powered off.
If you have defined one of the following actions as the event that causes the system to go into hibernation
mode, perform that action.
• Closing the lid.
• Pressing the power button.
Also, the computer goes into hibernation mode automatically in either of the following conditions:
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Hardware Maintenance Manual