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Appendix 2-6 Power Management Rev.A

Confidential

Video Off

Video Off Sequence

A2-3 Video Off Sequence

Comment

Video Off is recognized as Standby in internal BIOS.

Invalids BIOS Timer in Windows 98.

APM BIOS is in use under Windows 95, therefore, it sends Standby request to the OS and

performs Video off funtion by Standby command from the OS.

In other OS, if the BIOS Video Off Timer is timed out, BIOS performs Video Off function.

Transition of the BIOS setting time is possible, if APM BIOS is disabled under Windows 95/98

system.

The difference with the Suspend and Video off is that BIOS does not recognize whether or not

the Video is off when turned off the Video with Windows 95/98 timer.

Table A2-2 Conditions of Video Off Transition

according with

Windows 95 Windows 98 Windows NT DOS

Transtition by Timer Transit by the

shorter setting timer

comparing

between BIOS

Setup and OS

Transit by the OS

setting time

Transit by theBIOS

Setup setting time

Transit by the BIOS

Setup setting time

Video Off Timer is

timed out by the BIOS.

APMBIOS is used

Video Off process by

the BIOS.

The operation System’s

Video off Timer is timed out.

Video Off process

by the Operation

System.

Send Standby request to

the Operation System

from the BIOS.

Standby process by the

Operation System.

Send standby request to

the BIOS from the

Operation System.

Yes Windows 95

Windows NT, DOS

(Note)Windows 98 BIOS - APM Function

is disabled during the OS starting up,

therefore BIOS Timer does not operate

if APM is enabled.

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