linux-kernel - Re: v4.8-rc1: thinkpad x60: running at low frequency even during kernel build

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Message-ID: <20161105195619.GB8705@amd>
Date:   Sat, 5 Nov 2016 20:56:19 +0100
From:   Pavel Machek <pavel@....cz>
To:     Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:     "Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Zhang, Rui" <rui.zhang@...el.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "ibm-acpi-devel@...ts.sourceforge.net" 
        <ibm-acpi-devel@...ts.sourceforge.net>,
        "ibm-acpi@....eng.br" <ibm-acpi@....eng.br>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: v4.8-rc1: thinkpad x60: running at low frequency even during
 kernel build

On Sat 2016-11-05 16:04:58, Henrique de Moraes Holschuh wrote:
> On Sat, 05 Nov 2016, Pavel Machek wrote:
> > [  825.759661] thinkpad_acpi: THERMAL EMERGENCY: a sensor reports something is extremely hot!
> > [  825.761935] thinkpad_acpi: temperatures (Celsius): 101 49 N/A 78 33 N/A 33 N/A 47 50 N/A N/A N/A N/A N/A N/A
> 
> Oh boy, that must be the second time in a decade that I see that
> codepath triggering.  It is the second-level alert that the ThinkPad is
> about to catch fire.
> 
> It should have logged a "is too hot!" first-level alert earlier, but
> this depends on the EC and not the driver.  Maybe the temperature raised
> too fast.

I don't think I'm seeing the "is too hot" messages. Actually.. even
the "THERMAL EMERGENCY" messages seem to have too low severity, so
they are hidden in syslogs -- they don't go to all the consoles.

> In Windows, the system would attempt to hibernate or shutdown.  I would
> be quite happy to have thinkpad-acpi trigger such behavior as well,
> patches (or guidance) are welcome ;-)

Sorry, just guidance for now:

+#include <linux/reboot.h>
+               orderly_poweroff(true);

[can be called from weird contexts, afaict]. 

> Anyway, if that temperature goes about 1~2°C higher, the EC should cut
> power to your motherboard.  Apparently, the built-in thermal protection
> clock modulation on the Intel processor is somehow saving your box from
> that forced power-off.

Actually, the machine _will_ shut down some time after that. It seems
that one of acpi trip points jumps to 128C which forces shutdown.

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

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