Date: Wed, 29 Jul 2009 19:06:27 -0400 From: Ben Kaduk <minimarmot@gmail.com> To: Yoshihiro Ota <ota@j.email.ne.jp> Cc: Garrett Cooper <yanefbsd@gmail.com>, FreeBSD Current <freebsd-current@freebsd.org>, =?ISO-8859-1?Q?St=E5le_Lyngaas?= <staale@lyngaas.com> Subject: Re: Annoying whitenoise sound coming from snd_hda enabled chipset Message-ID: <47d0403c0907291606v3dd8857bo1fd9d49b10e2555f@mail.gmail.com> In-Reply-To: <20090728224331.4fc5ed50.ota@j.email.ne.jp> References: <7d6fde3d0902210101yfb42ff6yd0aa31e6f16b5761@mail.gmail.com> <558ffc2b0907231623v2bad80bbref035bd1fd950d39@mail.gmail.com> <20090728224331.4fc5ed50.ota@j.email.ne.jp>
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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
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