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Power management
Power management reduces the power consumption of certain components of the
computer such as the system power supply, processor, hard disk drives, and some
monitors. Advanced Power Management and Rapid Resume
™
Manager are
features of some personal computers.
Automatic configuration and power interface (ACPI) BIOS
Being an ACPI BIOS system, the operating system is allowed to control the power
management features of the computer and the setting for Advanced Power
Management (APM) BIOS mode are ignored. Not all operating systems support
ACPI BIOS mode.
Advanced Power Management
Energy-saving settings can be viewed and changed by using the Advanced Power
Management menu in the Configuration/Setup Utility program.
Attention:
If a device, such as a monitor, does not have power-management capabilities, it can be
damaged when exposed to a reduced-power state. Before making energy-saving selections
for the monitor, check the documentation supplied with the monitor to see if it supports
Display Power Management Signaling (DPMS).
Automatic Hardware Power Management features
Automatic Hardware Power Management can reduce the power states of the
computer, processor, and monitor (if the monitor supports DPMS) if they are
inactive for a predetermined length of time.
Set the time for the system to enter a low-power state.
You can define the amount of energy savings by specifying values for the
following options.
v System Power
– Select On for the computer to remain on.
– Select Off for the computer to shut down.
v
Display
Set display to be disabled or to be reduced at these power states:
– Standby: Screen is blank, but can be restored immediately when any activity
is detected.
– Suspend: Monitor uses less power than in Standby mode. Screen image is
restored after a few seconds when any activity is detected.
– Off: Monitor power is off. Press Monitor power button to restore power. On
some monitors, you might have to depress the power button twice.
Setting Automatic Hardware Power Management features
1. Start the Configuration/Setup Utility program (see “Starting the IBM Setup
Utility program” on page 19).
2. Select Power Management from the Configuration/Setup Utility program
menu.
150 Hardware Maintenance Manual