Newbie question about the APIC Function

ton · 22nd Aug 2006, 10:02 PM

Reading the BOG, I found the recommendation to enable APIC when running e.g. Windows XP. However the following text confuses me, and even scares me a little:
"Please note that if you have earlier installed Windows XP with ACPI enabled in the BIOS, Windows XP will no longer boot up if ACPI is disabled in the BIOS. You will need to reinstall Windows XP".
Does this mean that-when I now enable APIC- I run the risk that I can not boot up anymore when I disable it later, for instance when there will be problems with sound etc. ?
If so, does that also mean that I have to do a complete fresh install of Windows XP, complete with all my applications ?

Adrian Wong · 24th Aug 2006, 11:21 AM

Hello ton,

When you install Windows XP, it will check if you have ACPI enabled. How Windows XP manages resources like interrupts depends on whether ACPI is enabled or not.

So, if you install Windows XP with ACPI enabled, Windows will dynamically manage those resources using ACPI. But if you then disable ACPI in the BIOS, then Windows won't boot up properly.

You can always go back and re-enable ACPI. But if you choose NOT to enable ACPI, then you have to reinstall Windows XP so that it can use the resources as assigned by the BIOS.

Please note that you do NOT need a fresh install of Windows XP. A repair-install is more than enough. Your applications will work as usual. You just need to redownload those Windows XP updates.

Hope that helps you some.

eLPuSHeR · 24th Aug 2006, 04:13 PM

If your bios is up to date and unless it has a bad ACPI implementation I would leave it ENABLED all time.

Adrian Wong · 24th Aug 2006, 04:41 PM

Quote:

Originally Posted by eLPuSHeR

If your bios is up to date and unless it has a bad ACPI implementation I would leave it ENABLED all time.

I concur.

jamotto · 25th Aug 2006, 08:49 AM

Now all you have to do is decide what version to enable, Version 1, 2 or 3.

nebcat · 25th Feb 2007, 05:04 AM

Fantastic!

22nd Aug 2006, 10:02 PM	#1 (permalink)
ton Newbie Join Date: 22 Aug 2006 Posts: 1 Reputation: 0 Rep Power: 0	Newbie question about the APIC Function Reading the BOG, I found the recommendation to enable APIC when running e.g. Windows XP. However the following text confuses me, and even scares me a little: "Please note that if you have earlier installed Windows XP with ACPI enabled in the BIOS, Windows XP will no longer boot up if ACPI is disabled in the BIOS. You will need to reinstall Windows XP". Does this mean that-when I now enable APIC- I run the risk that I can not boot up anymore when I disable it later, for instance when there will be problems with sound etc. ? If so, does that also mean that I have to do a complete fresh install of Windows XP, complete with all my applications ?

24th Aug 2006, 11:21 AM	#2 (permalink)
Adrian Wong Da Boss Join Date: 10 Oct 2002 Location: In front of my BenQ Joybook 7000 notebook! Posts: 29,655 Reputation: 2846 Rep Power: 63	Hello ton, When you install Windows XP, it will check if you have ACPI enabled. How Windows XP manages resources like interrupts depends on whether ACPI is enabled or not. So, if you install Windows XP with ACPI enabled, Windows will dynamically manage those resources using ACPI. But if you then disable ACPI in the BIOS, then Windows won't boot up properly. You can always go back and re-enable ACPI. But if you choose NOT to enable ACPI, then you have to reinstall Windows XP so that it can use the resources as assigned by the BIOS. Please note that you do NOT need a fresh install of Windows XP. A repair-install is more than enough. Your applications will work as usual. You just need to redownload those Windows XP updates. Hope that helps you some. __________________ Dr. Adrian Wong Tech ARP \| Blog @ Tech ARP \| The Free Trade Zone DYKT : The only offshore account I have is at the sand bank? Keep Tech ARP free! Visit our sponsors! We need PROGRAMMERS and TECHNICAL WRITERS! Contact us if you are a hot shot programmer or technical writer! My items for sale : 50x SD Card \| Memory Stick PRO \| Cyclone Energy Saver \| Seiko SS watch \| Tiger/Carlsberg beer jugs \| Travel Speakers \| Motorola V600 \| Nokia N90 SOLD! \| New Lowepro Mini Trekker AW Other items for sale @ the FTZ : Zalman CNPS9500 LED @ $20 \| Zalman CNPS7700 Cu @ $20 \| Zalman CNPS7000 Cu @ $20 \| Swarovski bracelet watches \| Dell 17" LCD \| Hi-Fi speakers \| English DIVX movies \| HP LaserJet toners! \| Office chairs

24th Aug 2006, 04:13 PM	#3 (permalink)
eLPuSHeR Warming up Join Date: 7 Sep 2004 Posts: 89 Reputation: 18 Rep Power: 0	If your bios is up to date and unless it has a bad ACPI implementation I would leave it ENABLED all time. __________________ AMD Sempron 3000+ ABIT NF7 2.0 (nForce2 Ultra 400) 1GB 266Mhz DDR SDRAM WinXP Prof. SP2 ATi Radeon X800GTO AGP (256MB) SoundBlaster Audigy 2 SE

25th Aug 2006, 08:49 AM	#5 (permalink)
jamotto I'm a regular Join Date: 3 Mar 2005 Posts: 439 Reputation: 142 Rep Power: 5	Now all you have to do is decide what version to enable, Version 1, 2 or 3.

25th Feb 2007, 05:04 AM	#6 (permalink)
nebcat Newbie Join Date: 25 Feb 2007 Posts: 4 Reputation: 0 Rep Power: 0	Fantastic!