From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751026AbXGHEmL (ORCPT ); Sun, 8 Jul 2007 00:42:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751060AbXGHEl5 (ORCPT ); Sun, 8 Jul 2007 00:41:57 -0400 Received: from py-out-1112.google.com ([64.233.166.178]:49294 "EHLO py-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751026AbXGHEl4 (ORCPT ); Sun, 8 Jul 2007 00:41:56 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=p4C0V/SiYjyLh+ye37FDnBzz1l7twpFDE7rlnbYYOpkTrFQuFtt+Mg0yyuUyYAGIp5yt8GIz1O5xRAPMj4zoSq0keI+3GCgB8qOh3Z8UXOBpilXQi3Msr3evBresVdgRXddoeWm08y0nVIhAOMRa9WiMeHkSaQDCuxr3g34vfhs= Message-ID: <9a7c669e0707072141i7d0f6f65r8cdeee908202620d@mail.gmail.com> Date: Sun, 8 Jul 2007 00:41:55 -0400 From: "Tim Hull" To: "Henrique de Moraes Holschuh" Subject: Re: PROBLEM: MacBook makes whining noise when usb-uhci active Cc: "Gerald Britton" , "Alan Stern" , linux-kernel@vger.kernel.org In-Reply-To: <20070708042712.GC12052@khazad-dum.debian.net> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <9a7c669e0707071551v2705320dn876ad208fa60a537@mail.gmail.com> <20070708025457.GA2822@zante.sekrit.org> <20070708042712.GC12052@khazad-dum.debian.net> X-Google-Sender-Auth: 3e12ff395c344baf Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org After reading the ThinkPad wiki link, I've found that the problem has to do with the C3 and C4 ACPI states. I'm guessing that the 2.6.18 kernel I was using on Debian Etch just happened to not support full power management on my MacBook - hence, the problem didn't occur. Sorry for all of this - I guess I'll pass this info on to Apple and see if they may be able to fix this with a firmware update (it occurs on OS X too). On 7/8/07, Henrique de Moraes Holschuh wrote: > 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 >