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Chapter 8. Additional Service Information
179
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.
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.
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.
At each level, you can define the amount of energy savings by specifying values for
the following options.
•
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.
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).
Level 1 Set time from 5 minutes to 4 hours.
Level 2 Set time from 10 minutes to 5 hours.
Level 3 Set time from 15 minutes to 6 hours.