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Appendix 2-10 Power Management Rev.A
Confidential
APM Power Off
If the AC Fail is occured or Front Switch is pressed in this mode, BIOS sends APM event: “Power
mode changed” to the OS and does not turn off the power. OS does nothing in this event. If the
system is set as default that this event is performed by the application, then the rest of the
operation is performed by the application. Also, this event is same as for the event when the
front power switch is pressed in AC Fail mode. If the mode is changed, the application does not
recognize how the mode is changed.
If the front power switch is pressed for more than four seconds, the hardware (Chipset) turns off
the power.
APM Power Off Mode of the Front Power Switch Process Sequence
A2-6 APM Power Off Mode of the Front Power Switch Process Sequence
*1:Defines whether or not BIOS performed Video Off. If the OS is performing Video Off, Bios cannot recognize
whether Video is off or on.
*2:When APM BIOS is disabled(include Windows NT/DOS), the even may not be sent. Even if the event is sent, the
event is not received by the OS nor application while APM is not in use.
Pressing the Front
Power switch or AC
Faill.
Suspend Mode ?
No
Yes
Resume process by
BIOS
APM BIOS is used ?
Yes
No
Video Off ? *1
Yes
No
Video Off Resume
Sequence
(Appendix 2-7)
Send Resume request to
the Operation System
from BIOS.
Resume process by the
Operation System.
BIOS sends “Power
Status Changement”
Event to the Operation
System.
Normal Operation
(Full_On)
Processing by the
Application (OS does
not operate)