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Message from discussion 2.6.27-rc1: critical thermal shutdown on thinkpad x60 (bisected)
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Pavel Machek  
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 More options Aug 13 2008, 3:50 am
Newsgroups: linux.kernel
From: Pavel Machek <pa...@suse.cz>
Date: Wed, 13 Aug 2008 09:50:09 +0200
Local: Wed, Aug 13 2008 3:50 am
Subject: Re: 2.6.27-rc1: critical thermal shutdown on thinkpad x60 (bisected)
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On Tue 2008-08-12 17:48:27, Milan Broz wrote:

> >>>> yes. maybe some userspace tool controlling frequency is involved, no idea yet.
> >>>> But it is 2.6.26 tree for sure.

> >>> So it definitely is in 2.6.26.2, and it definitely is in 2.6.26?

> > The bug is _not_ in 2.6.26, it was introduced in 2.6.26.1.

> > The problem is, that now the CPU frequency doesn't decrease at some
> > temperature level and fan is unable to cool it properly.

> > bisect on 2.6.26.y tree finished in this patch:
> > (I expect similar patch in 2.6.27-rc)

> > commit 04f496871e8af87a1e40c504371a206fd7389193
> > Author: Thomas Renninger <tr...@suse.de>
> > Date:   Wed Jul 30 18:20:10 2008 +0000

> and this seems to fix it for me:
> --

> Do not use unsigned int if there is test for negative number...

> See drivers/acpi/processor_perflib.c
>   static unsigned int ignore_ppc = -1;
> ...
>   if (event == CPUFREQ_START && ignore_ppc <= 0) {
>        ignore_ppc = 0;
> ...

> Signed-off-by: Milan Broz <mb...@redhat.com>

Tested-by: Pavel Machek <pa...@suse.cz>

--
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