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

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Message-ID: <20161105180458.GB17290@khazad-dum.debian.net>
Date:   Sat, 5 Nov 2016 16:04:58 -0200
From:   Henrique de Moraes Holschuh <hmh@....eng.br>
To:     Pavel Machek <pavel@....cz>
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, 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.

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 ;-)

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.

-- 
  Henrique Holschuh