linux-kernel - IBM ThinkPad T23: Uhhuh. NMI received for unknown reason 30 on CPU 0.

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Message-Id: <1188507160.4640.18.camel@stefan2>
Date:	Thu, 30 Aug 2007 22:52:40 +0200
From:	Stefan Foerster <stefan.foerster@...t-online.de>
To:	linux-kernel@...r.kernel.org
Subject: IBM ThinkPad T23: Uhhuh. NMI received for unknown reason 30 on CPU
	0.

Hi all,

on my IBM ThinkPad T23 I often get the following messages (together with
a beep from the speaker):

-------------------
Message from syslogd@...fan2 at Thu Aug 30 22:02:17 2007 ...
stefan2 kernel: Uhhuh. NMI received for unknown reason 30 on CPU 0.

Message from syslogd@...fan2 at Thu Aug 30 22:02:17 2007 ...
stefan2 kernel: Do you have a strange power saving mode enabled?

Message from syslogd@...fan2 at Thu Aug 30 22:02:17 2007 ...
stefan2 kernel: Dazed and confused, but trying to continue

stefan@...fan2:~$ 
Message from syslogd@...fan2 at Thu Aug 30 22:32:08 2007 ...
stefan2 kernel: Do you have a strange power saving mode enabled?

Message from syslogd@...fan2 at Thu Aug 30 22:32:08 2007 ...
stefan2 kernel: Dazed and confused, but trying to continue

Message from syslogd@...fan2 at Thu Aug 30 22:32:08 2007 ...
stefan2 kernel: Uhhuh. NMI received for unknown reason 30 on CPU 0.
------------------

There seems to be no pattern in the "interarrival times" of this signal.
Sometimes I get it about every 30 minutes, sometimes only once a day.

It also doesn't depend on the kernel version. I now see this behaviour
on this notebook for 3 years now.

My current kernel version is 2.6.23-rc3 (plain vanilla kernel), Ubuntu
Gutsy Gibbon.

I have googled "Uhhuh. ..." and got exactly 3 (!) entries, but no
solution. But it seems that this is somehow typical for some notebooks,
especially ThinkPads.

Any ideas ?

Stefan

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