Appendix 2-6 Power Management Rev.A
Confidential
Video OffVideo 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 9 5/98 timer.
Table A2-2 Conditions of Video Off Transition according with OS
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
No
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.