From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nate Lawson Subject: Re: high pitch noise with kernel 2.6 and ACPI (Dell Inspiron 8200) Date: Wed, 18 Feb 2004 14:11:32 -0800 (PST) Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20040218140940.K36847@root.org> References: <200402181320.29381.mailinglists@glomann.de> <1077111155.2028.3.camel@personal-118.mip.sdu.dk> <200402182017.47960.mailinglists@glomann.de> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Return-path: In-Reply-To: <200402182017.47960.mailinglists-WoYc4IhrKEiELgA04lAiVw@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Thomas Glomann Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Wed, 18 Feb 2004, Thomas Glomann wrote: > On Wednesday 18 February 2004 14:32, Mads Paulin wrote: > > Hi Thomas, > > > > funny you mention it, I thought I was going crazy. > > > > I experienced the same thing, and discovered it to be the hard drive. > > > > Try to spind the drive down using hdparm and see if that helps. > > > nope, putting the drive to sleep doesn't do the trick. the sound remains. > Moreover I don't see how this "solution" was meant to work? Does the sound > reappear when you wake up your disk or does it keep silent after a nice > "onetime" sleep? > > Obviously this is not a solution, but if it helps, kernel 2.6 could have > > some other way of controlling the disk than 2.4. > > > Still it doesn't explain why that sound is gone when disabling the whole > acpi-system. > > The noise disappears when my hdd is under heavy load. > > - Maybe you just cant here it then, or it actually disappears because it > > is no longer idle > > > well thats true. as long as the disk is Not idle, the noise is gone. But > returns right after. Disable cpu idling support or try various combinations of C1-C3. The noise is most likely capacitors (dis)charging as part of chipset-supported clock stopping. You can detect this case by changing the scheduling quantum (HZ) to be something other than 1000. -Nate ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click