From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Renninger Subject: Re: strange buzzing sound after the 2.6.10 patch Date: Fri, 25 Feb 2005 11:47:58 +0100 Message-ID: <421F025E.7000706@suse.de> References: <1109280107.12887.30.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: <1109280107.12887.30.camel@localhost> Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Jeremy Moles Cc: acpi-devel-TtF/mJH4Jtrk1uMJSBkQmQ@public.gmane.org List-Id: linux-acpi@vger.kernel.org Jeremy Moles wrote: > Try this: > > edit /usr/src/linux/include/asm/param.h and change HZ to 100 (instead of > 1000). Other folks here can perhaps comment on the side-effects, though > I've noticed few I couldn't handle. Perhaps a divide by 0 warning with > some programs that "guess" at the HZ, but other than that... > > You'll find it only happens when the processor ACPI module is loaded. Go > figure. > > On Wed, 2005-02-23 at 21:31 -0500, Jing Su wrote: > >>Hello, >> >>I vaguely remember someone else mentioning this problem on the list >>before, but I don't recall if there were any answers to the solution. >> >>I'm running a vanilla 2.6.10 kernel patched with the acpi-2005-01-25 patch. >> >>When running the patched kernel, I noticed that my laptop makes a very >>strange and faint buzzing sound. I've determined that the buzzing >>sound is somewhat related to CPU and HD load. When the CPU load is >>heavy, or when the HD is busy, the buzzing stops. But when the system >>idles, the buzzing continues. I've also tried forcing the HD to go >>into suspension using hdparm, but the buzzing continues. >> >>Any hints or clues? >>If this problem hasn't been encountered before, I'd appreciate it if >>someone could give hints for how I can best go about isolating the >>problem. I heard it is because of switching C-states 1000 times a second. Loading the processor module with max_cstates=1 or 2 should work. Thomas ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click