Lenovo ThinkPad L520 Hardware Maintenance Manual - Page 49

Hibernation mode, Symptom-to-FRU index, Press the Fn+F12 keys. - ram

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Note: Even if you do not set the low-battery alarm, the charge indicator notifies you when the battery is low, and then the computer enters the power-saving mode automatically. To cause the computer to return from sleep (standby) mode and resume operation, do one of the following: • Press the Fn key. • Open the LCD cover. • Turn on the power switch. Also, in either of the following events, the computer automatically returns from sleep (standby) mode and resumes operation: • The ring indicator (RI) is signaled by a serial device or a PC Card device. • The time set on the resume timer elapses. Note: The computer does not accept any input immediately after it enters sleep (standby) 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. • The system is powered off. Note: If the computer enters the hibernation mode while it is docked to the docking station, do not undock it before resuming normal operation. If you do undock it and then try to resume normal operation, you will get an error message, and you will have to restart the system. To cause the computer to enter hibernation mode, do any of the following: • Press the Fn+F12 keys. • If you are using the APM operating system and have set the mode to Power switch mode [Hibernation], turn off the power switch. • If you are using the ACPI operating system and 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. - Pressing Fn+F4 keys. Also, the computer goes into hibernation mode automatically in either of the following conditions: • If a "hibernation time" has been set on the timer, and if the user does not do any operation with the keyboard, the TrackPoint, the hard disk drive, the parallel connector, or the diskette drive within that time. • If the timer conditions are satisfied in suspend mode. • If you are using the APM operating system and have set the mode to Hibernate when battery becomes low, and the battery charge becomes critically low. When the power is turned on, the computer returns from hibernation mode and resumes operation. The hibernation file in the boot record on the hard disk drive is read, and system status is restored from the hard disk drive. Symptom-to-FRU index This section contains following information: • "Numeric error codes" on page 44 Chapter 4. Related service information 43

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Note:
Even if you do not set the low-battery alarm, the charge indicator notifies you when the battery is low,
and then the computer enters the power-saving mode automatically.
To cause the computer to return from sleep (standby) mode and resume operation, do one of the following:
•
Press the Fn key.
•
Open the LCD cover.
•
Turn on the power switch.
Also, in either of the following events, the computer automatically returns from sleep (standby) mode and
resumes operation:
•
The ring indicator (RI) is signaled by a serial device or a PC Card device.
•
The time set on the resume timer elapses.
Note:
The computer does not accept any input immediately after it enters sleep (standby) 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.
•
The system is powered off.
Note:
If the computer enters the hibernation mode while it is docked to the docking station, do not undock it
before resuming normal operation. If you do undock it and then try to resume normal operation, you will get
an error message, and you will have to restart the system.
To cause the computer to enter hibernation mode, do any of the following:
•
Press the Fn+F12 keys.
•
If you are using the APM operating system and have set the mode to
Power switch mode [Hibernation]
,
turn off the power switch.
•
If you are using the ACPI operating system and 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.
–
Pressing Fn+F4 keys.
Also, the computer goes into hibernation mode automatically in either of the following conditions:
•
If a “hibernation time” has been set on the timer, and if the user does not do any operation with the
keyboard, the TrackPoint, the hard disk drive, the parallel connector, or the diskette drive within that time.
•
If the timer conditions are satisfied in suspend mode.
•
If you are using the APM operating system and have set the mode to
Hibernate when battery becomes
low
, and the battery charge becomes critically low.
When the power is turned on, the computer returns from hibernation mode and resumes operation. The
hibernation file in the boot record on the hard disk drive is read, and system status is restored from the
hard disk drive.
Symptom-to-FRU index
This section contains following information:
•
“Numeric error codes” on page 44
Chapter 4
.
Related service information
43