Hitachi SA200 manual Intel-Microsoft APM Interface

lonestar.boo : sa200.fm Page 70 Friday, March 6, 1998 10:53 AM

5 The Power System

Resume to Full Power mode may fail under the following conditions:

•The battery is low

•The size of system memory has been changed

•The hard disk has been changed

If the system cannot be restored to Full Power mode for any reason, a long warning beep sounds and this message displays:

Save to disk space is not found or insufficient.

Save to disk feature is disabled.

Press any key to continue.

Press any key and run the Suspend to Disk program again to create a Suspend to Disk partition. See Appendix C.

The Intel-Microsoft APM Interface

In addition to the power-saving features built into your laptop’s BIOS Setup program, the SA200 also supports the Intel-Microsoft Advanced Power Management (APM) Interface, version 1.2. This is a cooperative interface that enhances your laptop’s built-in power management features by providing one of the most accurate schemes for detecting true system idle. This scheme allows APM to put the CPU into a lower power state with no loss in laptop performance.

If you have APM installed on your laptop, you must enable the power management feature (set the PM control field to Enabled) in the BIOS Setup program. If you disable power management in the BIOS Setup program (set the PM control field to Disabled), you also disable APM regardless of its settings. When you enable the APM interface, APM will override any power management settings you may have made in the BIOS Setup program.

When properly installed and configured, APM:

•Takes over power management from the system BIOS.

•Constantly monitors all system activity, including the operating system, active programs, and the power consumption of all devices.

70 SA200