Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753252Ab0AYUqL (ORCPT ); Mon, 25 Jan 2010 15:46:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753130Ab0AYUqK (ORCPT ); Mon, 25 Jan 2010 15:46:10 -0500 Received: from lucidpixels.com ([75.144.35.66]:36793 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752273Ab0AYUqJ (ORCPT ); Mon, 25 Jan 2010 15:46:09 -0500 Date: Mon, 25 Jan 2010 15:46:06 -0500 (EST) From: Justin Piszcz To: Ian Campbell cc: Valdis.Kletnieks@vt.edu, linux-kernel@vger.kernel.org Subject: Re: High pitch noise when ACPI processor module is loaded. In-Reply-To: <1264414241.16526.84480.camel@zakaz.uk.xensource.com> Message-ID: References: <9883.1264397678@localhost> <1264414241.16526.84480.camel@zakaz.uk.xensource.com> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1745 Lines: 41 On Mon, 25 Jan 2010, Ian Campbell wrote: > 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. Hello, I tried this, but then the max speed bin is only 3.2GHz instead of 3.6GHz, it does solve the problem but limits the CPU quite a bit, see below: CPU GHz TSC %c0 %c1 %c3 %c6 %pc3 %pc6 %pc7 0 3.20 2.93 0.33 99.67 0.00 0.00 0.00 0.00 0.00 1 3.20 2.93 0.09 99.91 0.00 0.00 0.00 0.00 0.00 2 3.20 2.93 100.00 0.00 0.00 0.00 0.00 0.00 0.00 3 3.20 2.93 0.95 99.05 0.00 0.00 0.00 0.00 0.00 4 3.20 2.93 0.08 99.92 0.00 0.00 0.00 0.00 0.00 5 3.20 2.93 0.02 99.98 0.00 0.00 0.00 0.00 0.00 6 3.20 2.93 0.06 99.94 0.00 0.00 0.00 0.00 0.00 7 3.20 2.93 0.01 99.99 0.00 0.00 0.00 0.00 0.00 -- 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. Justin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/