Date: Tue, 28 Jul 2009 22:43:31 -0400 From: Yoshihiro Ota <ota@j.email.ne.jp> To: =?UTF-8?B?U3TDpWxl?= Lyngaas <staale@lyngaas.com> Cc: Garrett Cooper <yanefbsd@gmail.com>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Annoying whitenoise sound coming from snd_hda enabled chipset 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>
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On Fri, 24 Jul 2009 01:23:18 +0200 Ståle Lyngaas <staale@lyngaas.com> wrote: > On Sat, Feb 21, 2009 at 11:01 AM, Garrett Cooper<yanefbsd@gmail.com> 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
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