From: Christian Hesse <christian.hesse@linuxob.de>
Organization: Linux Oberhausen
To: linux-kernel@vger.kernel.org
Subject: Re: High pitched noise from laptop: processor.c in linux 2.6
Date: Thu, 7 Oct 2004 12:37:56 +0200
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Cc: Fraz <fraz@unimail.com.au>
References: <41650CAF.1040901@unimail.com.au>
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On Thursday 07 October 2004 11:30, Fraz wrote:
> I recently upgraded from linux 2.4.27 to 2.6.8.1 and noticed my laptop
> now makes a high pitch noise while idle. I traced it back to the
> processor module for acpi. 'rmmod processor' stops the noise.
>
> Using speed step to turn it down to 733 Mhz makes it a
> little quieter and doesn't change the tone.
>
> Is there any way to stop this? I googled around and found it had
> something to do with idle frequency of 1000 Hz in 2.6 instead of 100Hz
> in the 2.4 kernel. I couldn't find much else on this. Hunting around the
> code didn't help much, I don't know C.
>
> The laptop is a Compaq Evo N160 from Dec 2001. The reference in google
> was to a Centrino laptop with the same problem. I wrote to Dominik
> Brodowski who suggested posting here.

Take a look at this bug report:

http://bugme.osdl.org/show_bug.cgi?id=3D2478

=2D-=20
Christian Hesse

geek by nature
linux by choice

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