Re: gentle noise (was: (Offtopic) Humming on ibook2 audio port?)
On Thu, 2002-01-10 at 10:38, Siggi Langauf wrote:
> On Thu, 10 Jan 2002, Christopher C. Chimelis wrote:
>
> > > Well, now that I've listened closely to my earphones while plugged to the
> > > iBook, I've noticed a very high-pitched sound that occurs roughly every 2
> > > seconds and lasts for about half a second. Any guess what that could be?
> >
> > I'm still working on the tumbler (aka TAS) driver. I'll listen more
> > closely to my headphones when I make the changes to support things other
> > than the internal speakers (even those aren't filtered properly right now,
> > FYI).
>
> After a night of sleep and some more listening, I found out that these
> sonds occur when there is acces to the hard disk drive.
> I'm using ext3, therefore the regular peaks.
> When I do something like "find / -type f|xargs cat >/dev/null", I get a
> constantly chirping sound (still very high pitch and very low volume...)
>
> I guess it's a hardware issue, but haven't tried with MacOS yet.
> Maybe one could filter that out...
>
> It's not that bad; I guess you only hear the sound on earphones because
> the hard disk would be louder if you tried to listen to the speakers...
>
> Btw: thanks for your tumbler work! It was really nice to watch more and
> more of the sound features appear ;-)
>
> Maybe you want to have a look at the suspend mode: When pmud puts the
> machine to sleep while playing mp3s, I sometimes get strange noises when
> it wakes up again. The only way to fix this is to unload/reload the sound
> modules...
I had the same problem. The "quickie fix hack" is to reload the
dmasound_pmac module. It seems the driver doesn't properly reinitialise
the hardware. I had mine yelling some strident noise during 3 minutes
before I figured it out.... and I missed a bit of my film, bummer ;)
Cheers
--
/Bastien Nocera
http://hadess.net
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