From owner-freebsd-current@FreeBSD.ORG Wed Jul 29 02:43:28 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 4ECF6106564A for ; Wed, 29 Jul 2009 02:43:28 +0000 (UTC) (envelope-from ota@j.email.ne.jp) Received: from mail1.asahi-net.or.jp (mail1.asahi-net.or.jp [202.224.39.197]) by mx1.freebsd.org (Postfix) with ESMTP id 1F01E8FC19 for ; Wed, 29 Jul 2009 02:43:27 +0000 (UTC) (envelope-from ota@j.email.ne.jp) Received: from localhost (pool-70-110-182-250.phil.east.verizon.net [70.110.182.250]) by mail1.asahi-net.or.jp (Postfix) with ESMTP id 57B5972ED5; Wed, 29 Jul 2009 11:43:25 +0900 (JST) Date: Tue, 28 Jul 2009 22:43:31 -0400 From: Yoshihiro Ota To: =?UTF-8?B?U3TDpWxl?= Lyngaas Message-Id: <20090728224331.4fc5ed50.ota@j.email.ne.jp> In-Reply-To: <558ffc2b0907231623v2bad80bbref035bd1fd950d39@mail.gmail.com> References: <7d6fde3d0902210101yfb42ff6yd0aa31e6f16b5761@mail.gmail.com> <558ffc2b0907231623v2bad80bbref035bd1fd950d39@mail.gmail.com> X-Mailer: Sylpheed 2.6.0 (GTK+ 2.12.11; i386-portbld-freebsd7.1) Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Garrett Cooper , FreeBSD Current Subject: Re: Annoying whitenoise sound coming from snd_hda enabled chipset X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Jul 2009 02:43:28 -0000 On Fri, 24 Jul 2009 01:23:18 +0200 Ståle Lyngaas wrote: > On Sat, Feb 21, 2009 at 11:01 AM, Garrett Cooper wrote: > >    I don't know how else to describe it, but when I turn up my > > speakers enough (50%+) and don't have any sound playing, I hear a > > whitenoise hiss coming out of them. When I change webpages (nvidia > > driver is GIANT locked) or do something else kernel intensive it stops > > for a brief second, but apart from that it's an annoying trill sound > > almost like a mosquito humming around me waiting to be swatted. > > I suspect this is due to the CPU executing the HLT instruction. > > Try running the following command: > sysctl machdep.cpu_idle_hlt=0 > > -- > Ståle Lyngaas I couldn't find such a sysctl. The close one was machdep.cpu_hlt. It looks I hear the sound for sure when disk is busy. There are a couple other cases I hear the sound but the disk is idle. It happens 8-BETA1/2 but not 7.1-RELEASE, though for sure. Hiro