HP Vectra VL 5/xxx 5 manual Advanced Power Management APM

4 Summary of the HP/Phoenix BIOS

Power Saving and Ergonometry

Advanced Power Management (APM)

The BIOS is APM 1.2 compliant, providing it with facilities for advanced power management (APM). APM is incorporated in Windows for Workgroups 3.11, Windows 95 and OS/2, but not Windows NT. A file called power.exe is needed for APM under DOS.

APM is a standard, defined by Intel and Microsoft, for a power-saving mode that is applicable under a wide range of operating systems. It supports the following modes: Fully-on, Standby, Suspend, Hibernation and Off. Of these, APM 1.2 supports Fully-on, Standby, Suspend and Off, as summarized in the following table.

	Fully-On	Standby	Suspend	Off
Brought about using:		Setup menu	Operating system	Operating system
				Status panel button
Resume events:		Keyboard	Keyboard	Space-bar
		Mouse	Fax / Modem	Network (RPO)
			Network (RWU)
Resume delay:		Instantaneous	A few seconds	Boot delay
Processor	Normal speed	Clock throttled (divided	Halted	Halted
		by 8)
Hard disk drive	Normal speed	Normal speed	Halted	Halted
Display	Normal operation	Blanked (<30 W)	Blanked (<5 W typ)	Blanked (<5 W typ)
Power consumption	24 W to 47 W		< 30 W	< 3 W

The Suspend mode is managed at the operating system level only, from the Windows 95 Start menu. There is no longer the inter-activity between the Setup program and the operating system, and no longer a “sleep at” item on the Setup program menus, to avoid the BIOS from shutting down the system at the wrong moment.

RPO defines a variation from the standard Off state. In RPO mode, the main CPU hardware is off while a RPO function is powered by a power supply called VStandby. VStandby is active as soon as the computer is plugged in. RPO hardware can produce a triggering signal which turns on the computer.

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