linux-kernel - Re: 2.6.21-rc5: Thinkpad X60 gets critical thermal shutdowns

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Message-Id: <200704021035.40672.rene@exactcode.de>
Date:	Mon, 2 Apr 2007 10:35:40 +0200
From:	Rene Rebe <rene@...ctcode.de>
To:	Kyle Moffett <mrmacman_g4@....com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, Andi Kleen <ak@...e.de>,
	"Brown, Len" <len.brown@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 2.6.21-rc5: Thinkpad X60 gets critical thermal shutdowns

On Sunday 01 April 2007 20:57:57 Kyle Moffett wrote:
> On Mar 31, 2007, at 02:36:08, Jeremy Fitzhardinge wrote:
> > When I run 2.6.21-rc5 + Andi's x86 patches + paravirt_ops patches,  
> > I've been getting my machine shut down with critical thermal  
> > shutdown messages:
> >
> > Mar 30 23:19:03 localhost kernel: ACPI: Critical trip point
> > Mar 30 23:19:03 localhost kernel: Critical temperature reached (128  
> > C), shutting down.
> > Mar 30 23:19:03 localhost kernel: Critical temperature reached (128  
> > C), shutting down.
> > Mar 30 23:19:03 localhost shutdown[19417]: shutting down for system  
> > halt
> >
> > and the machine does feel pretty hot.  Interestingly, when the  
> > machine reboots, the fan spins up to a noticeably higher speed, so  
> > it seems that maybe something is getting fan speed control wrong.
> 
> Well, 128C is more than hot enough to boil water and well above the  
> thermal tolerances of most CPUs, so I would imagine that were your  
> CPU actually that hot it wouldn't be capable of printing the  
> "Critical temperature reached" messages, let alone properly rebooting.

IIRC a MSI Megabook S270 (I formerly owned) BIOS notifies this
"Critical temperature reached (128C)" when the battery run empty
when the OS did no action due to battery low indications. I guess
the BIOS people thought this is a good last resort to let the OS
really shutdown before the box just turns off.

Yours,

-- 
  René Rebe - ExactCODE GmbH - Europe, Germany, Berlin
  http://exactcode.de | http://t2-project.org | http://rene.rebe.name
  +49 (0)30 / 255 897 45
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