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    SubjectRe: 2.6.27-rc1: critical thermal shutdown on thinkpad x60 (bisected)
    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 <trenn@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 <mbroz@redhat.com>

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

    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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