Intermec 6100 Reference Guide

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Table 4Ć10 is a list of the defined power management events that the APM BIOS

can report:

Table 4Ć10 

Code
(Hex)

Description

0002

System Suspend Request Notification

0003

Normal Resume System Notification

0004

Critical Resume System Notification

0005

Battery Low Notification

0006

Power Status Change Notification

0008

Critical System Suspend Notification

000A

User System Suspend Request Notification

System Suspend Request Notification - notifies the APM Driver that the APM

BIOS wants to put the system into the Suspend State when the System Suspend

activity timer times out.  If APM BIOS power management is disabled, it is the

APM Driver's responsibility to determine whether the system should be placed in

the Suspend State.  The APM Driver must notify APMĆaware applications of the

System Suspend request.  This notification allows the device drivers the opportuĆ

nity to prepare for the suspend state change or to reject the request.
To process a suspend request, the APM Driver calls the Set Power State function

with BX = 0001h (all devices) and CX = 0002h when all processing is complete.

The APM BIOS (ELANAPM.EXE) does not enter the suspend state on its own

unless APM BIOS power management is enabled via the Enable/Disable Power

Management call.
Normal Resume System Notification - indicates that a System Resume from a

press of the SUSPEND/RESUME key after a normal System Suspend has ocĆ

curred.  The APM driver must update the time from the realĆtime clock when it

receives this notification and notify APMĆaware applications of the event.  The

applications are then responsible for preparing devices for use.
Critical Resume System Notification - indicates that a Critical Resume System

operation occurred.  The APM driver updates the time from the realĆtime clock

when it receives this notification and notifies APMĆaware applications of the

event.  These applications then prepare their devices for use.
Battery Low Notification - informs the APM driver that the system's battery is

running low.  The APM driver broadcasts this message to APMĆaware applicaĆ

tions.  The status of the battery must be retrieved by the Get Power Status call.
Power Status Change Notification - informs the APM driver that the system's

power status has changed.  The APM driver must issue the Get Power Status

call to determine the change to the charge status. ELANAPM.EXE signals a

Power Status Change Notification event when the system's charger input

changes status, when the battery flag changes, or the charge remaining changes.
Critical System Suspend Notification - notifies the APM driver that the APM

BIOS has detected a situation in which the system must be suspended and all

devices placed in an off state, as defined by the device.  The APM must broadcast

this message to all APMĆaware applications.  The driver must not refuse the susĆ

pend operation, even if APMĆaware applications refuse the notification, and must

verify that all devices are in the off state prior to issuing the suspend operation.