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

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Message-ID: <1264414241.16526.84480.camel@zakaz.uk.xensource.com>
Date:	Mon, 25 Jan 2010 10:10:41 +0000
From:	Ian Campbell <ijc@...lion.org.uk>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	Valdis.Kletnieks@...edu, linux-kernel@...r.kernel.org
Subject: Re: High pitch noise when ACPI processor module is loaded.

On Mon, 2010-01-25 at 04:26 -0500, Justin Piszcz wrote:
> So the question remains, is it possible to utilize turbo boost (in Linux)
> without the high pitch noise from the ACPI processor module?

I have to use the max_cstate=2 option to processor.ko in order to not
have a similar high pitch noise. I suppose you might get away higher
values of max_cstate depending on your hardware. Battery life doesn't
seem to be too adversely impacted.

Ian.

-- 
Ian Campbell
Current Noise: Ephel Duath - Ruins (Deep Blue And Violet)

Hmm...  Which would do a better job at driving physicists crazy?  Travel
faster than light, or a floating-point boolean value?
		-- Michael Mol

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