Lenovo ThinkPad A31p ThinkPad A30/p, A31/p Hardware Maintenance Manual (Septem - Page 39

When the power is turned on, the computer returns from, and the battery charge becomes critically low.

Page 39 highlights

Related service information Also, the computer goes into hibernation mode automatically in either of the following conditions: v If a "hibernation time" has been set on the timer, and 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. v If the timer conditions are satisfied in suspend mode. v 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. General descriptions 35

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Also, the computer goes into hibernation mode
automatically in either of the following conditions:
v
If a “hibernation time” has been set on the timer, and 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.
v
If the timer conditions are satisfied in suspend mode.
v
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.
Related service information
General descriptions
35