From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Glomann Subject: high pitch noise with kernel 2.6 and ACPI (Dell Inspiron 8200) Date: Wed, 18 Feb 2004 13:20:29 +0100 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <200402181320.29381.mailinglists@glomann.de> Reply-To: mailinglists-WoYc4IhrKEiELgA04lAiVw@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org Hello, I am running a Dell Inspiron 8200 laptop with a gentoo linux. Since my first experiments with kernel 2.6 I always experience a high noise frequency noise coming back right corner (psu?) of my laptop. This happens with every 2.6 kernel i have tried so far. Currently it is 2.6.2. This is definitely related to the ACPI system in the 2.6 kernels ! If i boot a kernel with the "acpi=off" option, then the noise is gone. And there is also a very strange thing. This sound occurs only in kernel 2.6. A 2.4 kernel patched with ACPI does NOT produce that sound. I haven't found any related information here in this mailing list (archive) but in the kernel mailing list, there you can find some posts describing exactly the same behavior. Someone suggested to use "apm=ide-treshold=100" as kernel option. But that didn't help, nor unloading thermal.o. (google for "high pitch noise" , there you will that thread) And there's two more things: # The noise is somewhat linked to the CPU clock. I have a mobile P4 processor with 2 performance profiles : 2000 and 1200 Mhz. The noise becomes quieter when changing to 1200 Mhz but it still is there. just not that loud as with the default 2000 Mhz. # The noise disappears when my hdd is under heavy load. I really like to get rid off that annoying sound. I can't bear it though it is only faint. For now, I use kernel 2.4 but I really want to switch to 2.6 and have acpi enabled of course. Please help me ! Thanks a lot ! regards Thomas Glomann Regensburg, Germany ------------------------------------------------------- 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