Date: Tue, 4 Aug 2009 13:46:15 -0400 From: Yoshihiro Ota <ota@j.email.ne.jp> To: Ben Kaduk <minimarmot@gmail.com> Cc: Garrett Cooper <yanefbsd@gmail.com>, FreeBSD Current <freebsd-current@freebsd.org>, =?UTF-8?B?U3TDpWxl?= Lyngaas <staale@lyngaas.com> Subject: Re: Annoying whitenoise sound coming from snd_hda enabled chipset Message-ID: <20090804134615.be30680f.ota@j.email.ne.jp> In-Reply-To: <47d0403c0907291606v3dd8857bo1fd9d49b10e2555f@mail.gmail.com> References: <7d6fde3d0902210101yfb42ff6yd0aa31e6f16b5761@mail.gmail.com> <558ffc2b0907231623v2bad80bbref035bd1fd950d39@mail.gmail.com> <20090728224331.4fc5ed50.ota@j.email.ne.jp> <47d0403c0907291606v3dd8857bo1fd9d49b10e2555f@mail.gmail.com>
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On Wed, 29 Jul 2009 19:06:27 -0400 Ben Kaduk <minimarmot@gmail.com> wrote: > 2009/7/28 Yoshihiro Ota <ota@j.email.ne.jp>: > > 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. > > Setting machdep.idle from acpi to spin make my problems go away. > (None of the other options (mwait, mwait_hlt, hlt, acpi) helped.) > > -Ben Kaduk After machdep.idle, the sound went away here, too. The laptop just got hotter, however. It looks this sound only comes from one of two laptop I have. I probabry live with the sound as it is the mid. summer now. Thanks for your info, though. Hiro
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