From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nate Lawson Subject: Re: High pitch noise produced when ACPI processor module loaded Date: Mon, 6 Oct 2003 09:41:19 -0700 (PDT) Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20031006093904.K3158@root.org> References: <001001c38404_27b959a0_2001a8c0@silverstone> <20030926100512.X64952@root.org> <20031002111232.GC14859@openzaurus.ucw.cz> <000401c38b23$fddef730$2401a8c0@INSPIRON> <20031005102452.GA321@elf.ucw.cz> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Return-path: In-Reply-To: <20031005102452.GA321-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Pavel Machek Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Sun, 5 Oct 2003, Pavel Machek wrote: > > > > > My inspiron 8600 (intel centrino/855PM) is producing a strange high > > pitch > > > > > sound which comes from within the machine (definitly not the speakers) > > when > > > > > the acpi processor module get's loaded. When I unload the processor > > module > > > > > the high pitch sound goes away. > > > > > Try running while1 program, see if it helps. > > Yes!, when there is intensive processor activity the sound goes away. > > This unfortunately seems fairly normal; at least all four notebooks I > had for testing produced some kind of cpu-related noise. It's a *feature*. I've implemented a Cx driver for FreeBSD and it's useful to be able to tell if the code really is entering the desired state by holding the laptop up to my ear. I can differentiate all the Cx states but not in the Px states. :) -Nate ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf