From: Thomas Renninger <trenn@suse.de>
Organization: SUSE Products GmbH
To: Christoph Hellwig <hch@lst.de>
Subject: Re: regression: 2.6.32-rc8 shuts down after reaching critical temperature
Date: Wed, 2 Dec 2009 16:07:52 +0100
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Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
       Zhang Rui <rui.zhang@intel.com>, linux-acpi@vger.kernel.org,
       linux-kernel@vger.kernel.org
References: <20091125102857.GA28310@lst.de> <200912021256.21683.trenn@suse.de> <20091202133032.GA9265@lst.de>
In-Reply-To: <20091202133032.GA9265@lst.de>
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On Wednesday 02 December 2009 14:30:32 Christoph Hellwig wrote:
> On Wed, Dec 02, 2009 at 12:56:20PM +0100, Thomas Renninger wrote:
... 
> > 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.
No need. Looks unrelated, the one system seem to overheat because of
no fan activity at all, yours seem to have a "passive cooling does not work
or kicks in too late" (and possibly also fan?) problem(s).

Best would be to open a bug on bugzilla.kernel.org and assign it to the
acpi component (and add Rui, Henrique and myself to CC. I won't be that
active, at least not the next days, just wanted to make sure whether
this isn't a duplicate).
dmesg, acpidump, grep . /proc/acpi/thermal_zone/*/*
and the shutdown messages should be most important info which
should show up there.

Some more hints you may want to try:

  - Does cpufreq work at all?
    Does this dir exist: /sys/devices/system/cpu/cpu*/cpufreq
    If temp of:
    watch -n1 cat /proc/acpi/thermal_zone/THM1/temperature
    goes beyond 96 C
    an ACPI processor event must get thrown and this:
    /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
    will get limited (lower than ../cpufreq/cpuinfo_max_freq).
    echo xy >/sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq
    may be bad workaround.
    These boot params: thermal.psv=90 thermal.tzp=10
    lowering all passive trip points to 90 and enabling polling
    might be a better one (with which you might be able to better
    test passive cooling). This really should be a runtime sysfs
    per thermal_zone parameter, but this is another story...
    
  - Is the ACPI event thrown at all?:
    SUSE has acpi_listen, not sure whether it's part of the acpid
    mainline project, I think it is. Do you see an ACPI event when
    96 C is past?
    If not this might workaround your issue:
    echo 10 >/proc/acpi/thermal_zone/THM1/polling_frequency (or similar)

  - T500 sounds pretty new. Still, make sure your fans are clean.
    E.g. the air must be really hot coming out at some point of time.

  - Also listen a bit to the fans. with thinkpad-acpi driver you might
    be able to monitor (T500 is rather new/untested) the fans:
    cat /proc/acpi/ibm/fan  # path out of my mind
    You might also be able to alter the fan behavior there.

Good luck,

    Thomas
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