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Date: Thu, 27 May 2004 11:14:06 +0200
From: Hendrik Hasenbein <hhasenbe@techfak.uni-bielefeld.de>
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To: David Gurvich <david.gurvich@verizon.net>
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cc: freebsd-current@freebsd.org
Subject: Re: APIC, ACPI nforce
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David Gurvich wrote:

> I've been having some trouble with nforce motherboard and
> FreeBSD-5.2.1-CURRENT.  The only combinations that I have found
> to work consistently are disabling ACPI  with hw.acpi.0.disabled="1" and
> either no PM or using apm, or enabling ACPI and APIC disabled with
> hw.apic.0.disabled="1".  This solution would not work for SMP kernel.
>    I'm not sure of the exact problem but there seems to be an irq
> sharing issue when both ACPI and APIC are enabled.  These coexisted with
> 11/2003 5.1 but as of 5.2.1 there have been problems for me.  Onbord
> Lan, USB, and either ACPI or APIC cannot coexist.  Boot with ACPI&APIC,
> start if_nv (nvnet) using dhclient,  USB-OHCI mouse.
> Use the onboard lan, i.e. open web-browser.  USB no longer responds, and
> onboard lan timeout.  No way to restart either without reboot.  Both work
> perfectly if either ACPI, or APIC is not started.  The mouse and lan are 
> both
> on pci0 at irq 10.

APIC is broken on nforce2 boards. I got an ASUS mainboard and the clock 
interrupt gets screwed up if I enable APIC. The boards are designed for 
a single processor so the only problem is that APIC is turned on by 
default now. I have heard of BIOS versions that could fix the interrupt 
problem, but I havent tried them yet.

Hendrik