To: linux-kernel@vger.kernel.org
From: Robert Hancock <hancockr@shaw.ca>
Subject: Re: Question about not saving power
Date: Wed, 24 Dec 2008 01:02:53 -0600
Message-ID: <4951DE9D.4050003@shaw.ca>
References: <200812241050.24804.patrakov@gmail.com>
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Alexander E. Patrakov wrote:
> Hello.
> 
> I tried playing with some audio apps like JACK and fluidsynth, and noticed the 
> following. If I set the parameters in JACK so that the latency becomes less 
> than ~10 milliseconds, a faint tone appears in the headphones connected to the 
> onboard sound card.
> 
> I guess that its frequency is the tone is the same as that of the interrupts 
> generated by the sound card. The tone disappears if I run something like 
> "while : ; do : ; done" that consumes CPU time continuously, so I guess this 
> has something to do with the power-saving features and less-than-perfect PSU.
> 
> My question is: what are my options (like kernel parameters) to disable power-
> saving features, other than running such CPU-eating process continuously?

You can try booting with idle=poll on kernel command line, so the CPU 
will not enter halt states..

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