IBM A40I TYPE 2271 Hardware Maintenance Manual

Contents

Power 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 arefeatures of 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 supportACPI BIOS mode.Advanced Power ManagementEnergy-saving settings can be viewed and changed by using the Advanced PowerManagement menu in the Configuration/Setup Utility program.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 selectionsfor the monitor, check the documentation supplied with the monitor to see if it supportsDisplay Power Management Signaling (DPMS).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 areinactive for a predetermined length of time.There are three levels of specified time that the computer must be inactive beforethe power management options that are selected take effect. Select the amount oftime that is offered within each level.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.At each level, you can define the amount of energy savings by specifying valuesfor the following options.vSystem Power– Select On for the computer to remain on.– Select Off for the computer to shut down.vProcessor SpeedSet the microprocessor to be disabled, or to run at 1, 10, 25, or 50 percent of itsinternal clock speed.vDisplaySet display to be disabled or to be reduced at these power states:Chapter 8. Additional Service Information 89