From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753245AbXGHE11 (ORCPT ); Sun, 8 Jul 2007 00:27:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750888AbXGHE1R (ORCPT ); Sun, 8 Jul 2007 00:27:17 -0400 Received: from out2.smtp.messagingengine.com ([66.111.4.26]:37496 "EHLO out2.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750814AbXGHE1R (ORCPT ); Sun, 8 Jul 2007 00:27:17 -0400 X-Sasl-enc: 2x5argo7YAATjDd01RtkqKx8p6Lfuv2POOSLWbNbAKeG 1183868836 Date: Sun, 8 Jul 2007 01:27:12 -0300 From: Henrique de Moraes Holschuh To: Gerald Britton Cc: Alan Stern , Tim Hull , linux-kernel@vger.kernel.org Subject: Re: PROBLEM: MacBook makes whining noise when usb-uhci active Message-ID: <20070708042712.GC12052@khazad-dum.debian.net> References: <9a7c669e0707071551v2705320dn876ad208fa60a537@mail.gmail.com> <20070708025457.GA2822@zante.sekrit.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070708025457.GA2822@zante.sekrit.org> X-GPG-Fingerprint: 1024D/1CDB0FE3 5422 5C61 F6B7 06FB 7E04 3738 EE25 DE3F 1CDB 0FE3 User-Agent: Mutt/1.5.16 (2007-06-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 07 Jul 2007, Gerald Britton wrote: > On Sat, Jul 07, 2007 at 10:17:34PM -0400, Alan Stern wrote: > > > [2.] Full description of the problem/report: On my MacBook (first generation > > > Core Duo 1.83GHz), I can hear a faint whining noise that becomes audible > > > when usb-uhci is loaded and remains audible except when the USB ports are in > > > use (i.e. the noise temporarily stops when I'm copying music to my iPod). > > > > You have a USB keyboard, right? So the ports are always in use -- > > unless you unplug the keyboard. > > > > > This problem occurs on both 2.6.21 and 2.6.22-rc7, but does not occur on > > > 2.6.18. Unloading usb-uhci when booted in 2.6.22-rc7 makes the whining > > > noise stop, but the system is useless in this state for obvious reasons. > > > The same whine does occur in OS X that occurs in 2.6.22-rc7 (though it does > > > NOT occur in 2.6.18) > > > > Anyway it's clearly a hardware problem, even if it is triggered by > > something in software. About all I can suggest is to surround the > > MacBook with something sound-absorbent. (Not very helpful, I agree.) > > I have a similar problem with my new Thinkpad X60 Tablet. In this case, > I have a high pitched whine which is only caused when USB drivers are loaded, > I am on battery, and there are no devices connected to USB. I suspect > something involved with CONFIG_USB_SUSPEND (which is enabled) is causing this > whine, but I haven't dug deeper to find out a more precise cause. > > For reference, I'm running Fedora 7's 2.6.21-1.3228.fc7 x86_64. http://www.thinkwiki.org/wiki/Problem_with_high_pitch_noises might give you some hints, and yes, it is a hardware design problem. -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh