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Does Windows 98 override BIOS power settings?

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Dom

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Jan 31, 2000, 3:00:00 AM1/31/00
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Hi All,

On my system, there are similar settings for power management settings in
both the system BIOS and Windows 98 (standby time, suspend time, etc...)
What settings take prescidence? Will there be a conflict if the timers
are set in BOTH places? What if the timers for similar functions are set
to different times? Or should one set of timers be set to 0?

Also, my system board's BIOS allows me to set "power management" to APM or
ACPI, or APM/ACPI. What is the difference between the 2 modes (APM and
ACPI)? How can BOTH modes be set (the APM/ACPI selection)? Finally, what
should this be set to for a Windows 98 system? I have found NO
documentation on these settings, the manuals mearly acknowledge the
existance of these selections, not what they do.

Any help would be much appreciated!

Thanks,
Dom...

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Ron Badour

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Jan 31, 2000, 3:00:00 AM1/31/00
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It's on an individual computer basis--if you change settings in Windows and
they don't work, chances are your bios is overriding the Windows settings.

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Regards

Ron Badour, MS MVP W95/98 Systems
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Dom <dominic...@cho.ge.com> wrote in message
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Walter Clayton

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Feb 1, 2000, 3:00:00 AM2/1/00
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***

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To elaborate a bit on Ron's comment. APM and ACPI are two different power
management interfaces between the operating system and the BIOS. They are
mutually exclusive; i.e. you can use one or the other but not both on the
same hardware. ACPI is the newest power management technology that allows
component level power management. APM is an older technology that basically
does nothing more than allow the machine to be turned off automatically with
all components on the motherboard either fully powered or powered off.

Regardless of which one you use however, 98 does not override the BIOS. If
you enable power management timers in the BIOS they can and will preempt 98
power management decisions. By the same token, the 98 functions can and will
preempt the BIOS timers. The problem is that if you let the BIOS do it's
thing and it preempts 98, it can cause 98 and the BIOS to clash. It's better
to either let the BIOS perform all power management or let 98 perform all
power management, never both. And of the two options, it's better to disable
the BIOS timers and let 98 make the decisions.
As for why you have a dual ACPI/APM option in your BIOS or what that means I
don't know. I've never seen that before and could only speculate. For the
proper answer to that, check with your system/motherboard vendor to see what
that means and what it implies.

As for which setting (ACPI or APM) is better for 98 will depend. If your
motherboard is up to spec on ACPI you do get superior power management
abilities, otherwise it generally doesn't make a difference. 98 is happy
with using either.

--
Walter Clayton
Microsoft MVP (DTS)
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