From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263591AbTLEKcn (ORCPT ); Fri, 5 Dec 2003 05:32:43 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263595AbTLEKcn (ORCPT ); Fri, 5 Dec 2003 05:32:43 -0500 Received: from 062016131079.customer.alfanett.no ([62.16.131.79]:64654 "EHLO shogun.thule.no") by vger.kernel.org with ESMTP id S263591AbTLEKcm (ORCPT ); Fri, 5 Dec 2003 05:32:42 -0500 Message-ID: <3FD05E9C.5080501@thule.no> Date: Fri, 05 Dec 2003 11:31:56 +0100 From: Troels Walsted Hansen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031007 X-Accept-Language: en MIME-Version: 1.0 To: Jean-Marc Valin CC: linux-kernel@vger.kernel.org Subject: Re: High-pitch noise with 2.6.0-test11 References: <1070605910.4867.9.camel@idefix.homelinux.org> In-Reply-To: <1070605910.4867.9.camel@idefix.homelinux.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jean-Marc Valin wrote: > I just installed 2.6.0-test11 on my Dell Latitude D600 (Pentium-M) > laptop and I noticed a strange high-pitch noise comming from the laptop > itself (that wasn't there with 2.4). The noise happens only when the CPU > is idle. Also, I have noticed that removing thermal.o makes the noise > stop, which is very odd. Is there anything that can be done about that? I had the same problem with my Dell Latitude C600 and newer kernels with HZ>100. The solution I found was to add "apm=idle-threshold=100" to the kernel commandline, to disable APM idle calls. You should monitor the temperature of your laptop to make sure it doesn't spin wildly and create extra heat if you use the same solution. Using ACPI instead of APM might also be a solution? Troels