linux-kernel - Re: regression: 2.6.32-rc8 shuts down after reaching critical temperature

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Date:	Wed, 2 Dec 2009 14:30:32 +0100
From:	Christoph Hellwig <hch@....de>
To:	Thomas Renninger <trenn@...e.de>
Cc:	Christoph Hellwig <hch@....de>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Zhang Rui <rui.zhang@...el.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: regression: 2.6.32-rc8 shuts down after reaching critical temperature

On Wed, Dec 02, 2009 at 12:56:20PM +0100, Thomas Renninger wrote:
> The critical temperature for the shutdown should still be logged in:
> /var/log/messages
> Can you grab that one out, please.

brick:/home/hch# grep "Critical temperature reached" /var/log/kern.log.1 
Nov 23 17:58:27 brick kernel: [  976.674070] Critical temperature reached (100 C), shutting down.
Nov 23 18:05:59 brick kernel: [  411.639261] Critical temperature reached (102 C), shutting down.
Nov 23 22:20:43 brick kernel: [15159.677691] Critical temperature reached (102 C), shutting down.
Nov 25 11:06:33 brick kernel: [10947.132102] Critical temperature reached (103 C), shutting down.
Nov 25 11:53:50 brick kernel: [ 2795.261765] Critical temperature reached (102 C), shutting down.
Nov 25 11:53:55 brick kernel: [ 2800.128671] Critical temperature reached (100 C), shutting down.
Nov 26 11:30:24 brick kernel: [  395.692667] Critical temperature reached (100 C), shutting down.
Nov 27 13:36:18 brick kernel: [  390.408366] Critical temperature reached (100 C), shutting down.

> 
> But from what we know, this sounds like a real overheating and not a
> wrongly read value,

It sounds like that to me, but something in .32-rc causes it to not
throttle early enough.  .31 goes very close to the max all the time, but
something thottles it to not actually go over it.

> Can we be sure it's because of the fans?

No idea, really.  The fan rarely every starts when using .31, but comes
in a lot using .32-rc

> 2.6.31 works?

Yes, perfectly.  Have been running it for a couple of days now again
after I had all these reproducible .32-rc shutdowns when testiong it.

> Also the latest stable one?

Haven't tried that yet, will do if it helps you.

> Then this one might be unrelated (11.2, 2.6.31.X based, Acer Aspire 5315):
> [Bug 557850] System Fan is being stopped on boot, CPU goes overheated and shut down instantly
> https://bugzilla.novell.com/show_bug.cgi?id=557850

Well, I do hear the fan on .32-rc (not on .31 usually).

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