linux-kernel - Re: High pitch noise when ACPI processor module is loaded.

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Message-ID: <20100125223816.GA16685@sucs.org>
Date:	Mon, 25 Jan 2010 22:38:16 +0000
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	Ian Campbell <ijc@...lion.org.uk>, Valdis.Kletnieks@...edu,
	linux-kernel@...r.kernel.org
Subject: Re: High pitch noise when ACPI processor module is loaded.

On Mon, Jan 25, 2010 at 03:46:06PM -0500, Justin Piszcz wrote:
>
> It would be nice if it were possible to find out what is causing it exactly
> in the acpi cpufreq module, as this problem does not occur in Windows 7 and
> I can achieve 3.6GHz in Windows 7 w/out any high pitch noise.

That may well be related to the interrupt frequency the kernel is
running with. I remember reading that a lower HZ were less likely to
cause chip whine on some machines...

http://www.thinkwiki.org/wiki/Problem_with_high_pitch_noises#Change_the_timer_interrupt_frequency

-- 
Sitsofe | http://sucs.org/~sits/
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