Chapter 8. Additional Service Information 195Power managementPower management reduces the power consumption of certain components of thecomputer such as the system power supply, processor, hard disk drives, and somemonitors. Advanced Power Management and Rapid Resume™ Manager are featuresof some personal computers.Automatic configuration and power interface (ACPI)BIOSBeing an ACPI BIOS system, the operating system is allowed to control the powermanagement features of the computer and the setting for Advanced PowerManagement (APM) BIOS mode are ignored. Not all operating systems support ACPIBIOS mode.Advanced Power ManagementEnergy-saving settings can be viewed and changed by using the Advanced PowerManagement menu in the Configuration/Setup Utility program.Automatic Hardware Power Management featuresAutomatic Hardware Power Management can reduce the power states of thecomputer, processor, and monitor (if the monitor supports DPMS) if they are inactivefor a predetermined length of time.There are three levels of specified time that the computer must be inactive before thepower management options that are selected take effect. Select the amount of timethat is offered within each level.At each level, you can define the amount of energy savings by specifying values forthe following options.•System Power— Select On for the computer to remain on.— Select Off for the computer to shut down.•Processor SpeedSet the microprocessor to be disabled, or to run at 1, 10, 25, or 50 percent of itsinternal clock speed.Attention:If a device, such as a monitor, does not have power-management capabilities, it can bedamaged when exposed to a reduced-power state. Before making energy-saving selections forthe monitor, check the documentation supplied with the monitor to see if it supports DisplayPower 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.
