Re: High pitched noise from laptop: processor.c in linux 2.6

[Måns Rullgård]

Pavel Machek <pavel@xxxxxx> writes:

> 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...

... and lose all the benefits of HZ=1000.  What would happen if one
were to set HZ to a higher value, like 10000?

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

Actually, I don't know which is worse, patent abuse or Java misuse.

-- 
Måns Rullgård
mru@xxxxxxxxxx

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