Advanced Power Management (Apm) - HP Vectra VA6 Technical Reference Manual

4 Summary of the HP/Phoenix BIOS
Remote Power-On (RPO)

Advanced Power Management (APM)

APM is incorporated in Windows for Workgroups 3.11, Windows 95 and
OS/2. A file called is needed for APM under DOS.
power.exe
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 consists of the
following modes: Fully-on, Standby, Suspend, Hibernation, Off. Of these,
APM 1.1 supports: Fully-on, Standby, Suspend, Off.
The Suspend mode, which used also to be known as Sleep, is now managed
at the operating system level only, and by pressing the "sleep" icon. There is
no longer the inter-activity between BIOS Setup and operating systems, and
no longer a "sleep at" item in the desktop configuration 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 PC is plugged in. RPO
hardware can produce a triggering signal which turns on the PC.
The following diagram gives a simplified view of the useful states that the PC
can be in: the three On states (Fully-On, Standby and Suspend), the RPO
state (when the CPU is Off, and the RPO hardware is powered by
VStandby), the Off state (when everything is powered off), and the state
that is caused by power failure or unplugging the PC.
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