From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753658Ab1LLR2S (ORCPT ); Mon, 12 Dec 2011 12:28:18 -0500 Received: from billgribble.com ([65.99.215.30]:59180 "EHLO mail.billgribble.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753642Ab1LLR2P (ORCPT ); Mon, 12 Dec 2011 12:28:15 -0500 Message-ID: <1323710873.3638.2.camel@debian.lii> Subject: Re: Mystery clicking under keyboard, 3.x only, SSD only From: Bill Gribble To: "Alexander E. Patrakov" Cc: linux-kernel@vger.kernel.org Date: Mon, 12 Dec 2011 12:27:53 -0500 In-Reply-To: <4EE635A2.8080705@gmail.com> References: <20111211142451.63febb26@pequin> <4EE635A2.8080705@gmail.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.0.3-3+b1 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2011-12-12 at 23:10 +0600, Alexander E. Patrakov wrote: > This clicking can be related to the events when the device goes to deep > powersaving levels. Fluctuations in the consumed current can lead to > audible clicks due to bad screening of audio wires, loose ferrite cores > in the coils, magnetostriction effect, etc. > > You can test this theory by running several copies of "yes > /dev/null" > and thus eating 100% CPU. If this eliminates the clicking effect, then > my guess is correct and you have to disable some of the deepest > powersaving states to remove the clicks. Got it in one! Causing 100% CPU utilization does indeed stop the clicking. I will look for power saving settings that I can control. Thanks, Bill Gribble