Date: Thu, 7 Oct 2004 12:32:10 +0200
From: Pavel Machek <pavel@ucw.cz>
To: Fraz <fraz@unimail.com.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: High pitched noise from laptop: processor.c in linux 2.6
Message-ID: <20041007103210.GA32260@atrey.karlin.mff.cuni.cz>
References: <41650CAF.1040901@unimail.com.au>
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Hi!

> 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. 

Change #define HZ 1000 to #define HZ 100...

Ouch and btw it is hardware problem -- too cheap capacitors.
								Pavel
-- 
Boycott Kodak -- for their patent abuse against Java.
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