linux-kernel - thinkpad x60: critical thermal shutdown does not work (and ethernet overheats)

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Message-ID: <20120515181004.GA2499@elf.ucw.cz>
Date:	Tue, 15 May 2012 20:10:04 +0200
From:	Pavel Machek <pavel@....cz>
To:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	kernel list <linux-kernel@...r.kernel.org>,
	ibm-acpi-devel@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org
Subject: thinkpad x60: critical thermal shutdown does not work (and ethernet
 overheats)

Hi!

I have rather old thinkpad x60 here. Long time ago, I noticed that on
high continuous ethernet load, it shuts itself down in regular
way. I traced it down to overheat, followed by ACPI signaling system
to go down.

This no longer works in recent kernels. (3.4-rc7 tested, but probably
it does not work correctly in 3.2 either). Now machine just hangs when
it should start /sbin/poweroff. If I then turn it on, it hangs during
ACPI init. I have to let it cool down, then it can boot.

Now:

a) Any ideas how to solve the overheating problem? Is it hw or sw? Are
there workarounds... like should I go to 10mbit? (It overheats even
under 2MB/sec continuous load...). Is it common thinkpad fault?

b) Why did it stop shutting down correctly? Can you reproduce it by
overheating machine artifically?

Ideas?
									Pavel

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