linux-kernel - Re: 2.6.31-rc5 regression: x86 MCE malfunction on Thinkpad T42p

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Message-ID: <20090810125651.GB6082@sig21.net>
Date:	Mon, 10 Aug 2009 14:56:51 +0200
From:	Johannes Stezenbach <js@...21.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.31-rc5 regression: x86 MCE malfunction on Thinkpad T42p

On Mon, Aug 10, 2009 at 02:32:28PM +0200, Andi Kleen wrote:
> > > The appended patch should remove the warning. Can you please test it?
> > 
> > It works (no more warning), but I feel I'm better off using "lapic"
> 
> Thanks for testing.
> 
> > because it enables thermal monitoring and performance counters.
> 
> When the BIOS doesn't enable it then force enabling lapic might not work.
> 
> This could cause either boot failures (obvious) or more subtle
> problems like SMM doing something unexpected. Just saying that if you have 
> strange problems later first try disabling this option again.

Thanks for the heads-up.  I remember I tried to use oprofile
in the past on this machine and was disappointed that it only
got the timer event.  I'll keep lapic for now unless I see
signs of instability.


Johannes
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