IBM 2681 Hardware Maintenance Manual - Page 37

Power, management

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Related service information Power management To reduce power consumption, the computer has three power management modes: screen blank, standby, and hibernation. Notes v Screen blank mode is called standby mode in Windows 95 and Windows NT. v Standby mode is called suspend mode in Windows 95 and Windows NT. Screen blank mode Screen blank mode has three variants, as follows: 1. If you press Fn+F3, or the time set on the "LCD off timer" in IBM BIOS Setup Utility expires, v The LCD backlight turns off. v The hard-disk drive motor stops. v The speaker is muted. 2. If you are using the ACPI operating system and you press Fn+F3, v The LCD backlight turns off. v The hard-disk drive motor stops. 3. If the time set on the "Turn off monitor" timer in the operating system expires, v The LCD backlight turns off. To end screen blank mode and resume normal operation, press any key. Standby mode When the computer enters standby mode, the following events occur in addition to what occurs in screen blank mode: v The LCD is powered off. v The hard-disk drive is powered off. v The CPU stops. To enter standby mode, press Fn+F4. Note: You can change the action of Fn+F4, if you are using the ACPI operating system. In certain circumstances, the computer goes into standby mode automatically: v If a "suspend time" has been set on the timer, and the user does not do any operation with the keyboard, the TrackPoint, the hard disk, the parallel connector, or the diskette drive within that time. General descriptions 33

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Power
management
To
reduce
power
consumption,
the
computer
has
three
power
management
modes:
screen
blank,
standby,
and
hibernation.
Notes
v
Screen
blank
mode
is
called
standby
mode
in
Windows
95
and
Windows
NT.
v
Standby
mode
is
called
suspend
mode
in
Windows
95
and
Windows
NT.
Screen
blank
mode
Screen
blank
mode
has
three
variants,
as
follows:
1.
If
you
press
Fn+F3,
or
the
time
set
on
the
“
LCD
off
timer
”
in
IBM
BIOS
Setup
Utility
expires,
v
The
LCD
backlight
turns
off.
v
The
hard-disk
drive
motor
stops.
v
The
speaker
is
muted.
2.
If
you
are
using
the
ACPI
operating
system
and
you
press
Fn+F3,
v
The
LCD
backlight
turns
off.
v
The
hard-disk
drive
motor
stops.
3.
If
the
time
set
on
the
“
Turn
off
monitor
”
timer
in
the
operating
system
expires,
v
The
LCD
backlight
turns
off.
To
end
screen
blank
mode
and
resume
normal
operation,
press
any
key.
Standby
mode
When
the
computer
enters
standby
mode,
the
following
events
occur
in
addition
to
what
occurs
in
screen
blank
mode:
v
The
LCD
is
powered
off.
v
The
hard-disk
drive
is
powered
off.
v
The
CPU
stops.
To
enter
standby
mode,
press
Fn+F4.
Note:
You
can
change
the
action
of
Fn+F4,
if
you
are
using
the
ACPI
operating
system.
In
certain
circumstances,
the
computer
goes
into
standby
mode
automatically:
v
If
a
“
suspend
time
”
has
been
set
on
the
timer,
and
the
user
does
not
do
any
operation
with
the
keyboard,
the
TrackPoint,
the
hard
disk,
the
parallel
connector,
or
the
diskette
drive
within
that
time.
Related
service
information
General
descriptions
33