Annoying whitenoise sound coming from snd_hda enabled chipset

[Ståle Lyngaas]

On Sat, Feb 21, 2009 at 11:01 AM, Garrett Cooper<yanefbsd at 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