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Date: Wed, 5 Mar 2003 11:12:39 -0500
To: Mikael Pettersson <mikpe@user.it.uu.se>
Cc: Jan Harkes <jaharkes@cs.cmu.edu>, linux-kernel@vger.kernel.org
Subject: Re: Local APIC support interacting badly with cardbus/orinoco
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On Wed, Mar 05, 2003 at 02:17:36PM +0100, Mikael Pettersson wrote:
> Jan Harkes writes:
>  > I've been tracing a problem where my wavelan card causes lockups on my
>  > thinkpad X20 laptop.
>  > Mar  4 23:42:55 mentor kernel: Local APIC disabled by BIOS -- reenabling.
>  > Mar  4 23:42:55 mentor kernel: Could not enable APIC!
>  > 
>  > Which made me think that the APIC code wasn't used, so I don't know how
>  > any changes in that area could be responsible for the cardbus/orinoco
>  > flakiness.
> 
> The message means that you have one of those mobile P6 processors
> where Intel actually removed the local APIC.
> (`grep flags /proc/cpuinfo` should not contain "apic" in your case.)

Correct, cpuinfo tells me it is a Pentium III (Coppermine), and the apic
flag is not net.

> So the local APIC really isn't being enabled or used, and any
> instability is caused by something else.
> 
> Please try 2.5.63 or .64 instead. Your 2.5.58/.59/.60 hybrid is
> getting old, and your mixing of stuff may itself cause problems.

2.5.57 - wavelan worked
2.5.58 - couldn't recognize the card
2.5.59 - Oops during boot when loading modules
2.5.60 - wavelan broken
2.5.61/62 - skipped these
2.5.63 - wavelan still broken

2.5.64 wasn't released yet, and noone seems to have reported a similar
problem. So I went back, trying 2.5.58 with enough patches from .59 that
it could load the card, and it worked. Then I tried 2.5.59 with just
enough patches to avoid the Oops during module loading and it didn't
work.

I am running 2.5.64 without Local APIC support and it seems to work.
I'll rebuild with Local APIC, which clearly shouldn't make a difference
because my CPU doesn't have one and see if the problem returns.

Jan

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