Re: Annoying whitenoise sound coming from snd_hda enabled chipset

On Fri, 24 Jul 2009 21:43:53 +0300
Alexander Motin <mav_at_FreeBSD.org> wrote:

> Yoshihiro Ota wrote:
> > The problem is some mysterious sound like szzzz..... in very low tone and low volume.
> > However, it is noticeable and somewhat destructing.
> > I usually use 7.1-RELEASE, but as 8.0 being in BETA, I installed 8-BETA1 and BETA2.
> > Both of these versions has this noise.
> > 
> > The noise is very much like the same noise I experienced back in February.
> > At that time, you, Alexander, fixed the problem.
> > I had had used 8-CURRENT until end of April but I was away until this time.
> > Because the symptom was smiler, I decided to reply to the old e-mail chain.
> 
> Sorry, I don't remember what have I done that time, if it really was me. 
> I have reread that thread and haven't found anything except assumptions 
> that it can be radio interference due to low quality power filtering or 
> something alike. May be "szzzz..." is just the sound of your disk, CPU, 
> CPU bus, some power converter, or whatever else. It may depend for 
> example on powerd running or system load, or C-state used or whatever 
> else unrelated.
> 
> -- 
> Alexander Motin

That is okay even if you don't have a clue.

I have both 7.1-RELEASE and 8-BETA1/2 on the same machine.
What ever causing the sound is due to this.

If time permits, I will try to do binary search, then.

Hiro