Power Management - IBM 3746-900 Installation And Maintenance Manual

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
Automatic Hardware Power Management features
Automatic Hardware Power Management can reduce the power states of the
computer, processor, and monitor (if monitor supports DPMS) if they are inactive
for a predetermined length of time.
There are three levels of specified time that the computer must be inactive before
the power management options that are selected take effect. Select the amount of
time that is offered within each level:
Level 1
Level 2
Level 3
At each level, you can define the amount of energy savings by specifying values for
the following options:
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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).
Set time from 5 minutes to 4 hours.
Set time from 10 minutes to 5 hours.
Set time from 15 minutes to 6 hours.
System Power:
– Select On for the computer to remain on.
– Select Off for the computer to shut down.
Processor Speed:
Set the microprocessor to be disabled, or to run at 1, 10, 25, or 50 percent of
its internal clock speed.
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 press the power button twice.