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SubjectRe: IO-APIC on nforce2 [PATCH] + [PATCH] for nmi_debug=1 + [PATCH] for idle=C1halt, 2.6.5
On Thu, 29 Apr 2004, Ross Dickson wrote:

> > Do you really think so? I think there may be a resonance occuring, even with
> > this new BIOS. I plugged in new headphones into my nforce2 onboard sound, and
> > get a high pitched noise. Now here is where it gets weird: This noise does
> > not occur on boot until sometime after the IDE driver is loaded. I also
> > believe it varies under a high load. If you disable C1 disconnect, it's gone.
> > Also I've heard a high pitched noise at certain times coming right from the
> > copmuter (very faint, but I do have very good hearing, I can even hear a hush
> > sounding from my router. my brother was quite astonished when I pointed that
> > out) I try to distinguish whats doing it. It could be the hard drive. But
> > when I found the other sound in the head phones, I found that the sound varies
> > almost in unison with the sound coming from the computer. Maybe the IDE or
> > hard drive is related, but it is too much related to C1 disconnect.
> I think I might break out my oscilloscope this weekend and have a look at how
> clean the supply rails are around the cpu and northbridge and southbridge.
> Who knows I might get lucky and see some unexpected ripple or spikes.

Not necessarily related to the PSU, but the noise may actually be the
reason of spurious timer interrupts.

+ Maciej W. Rozycki, Technical University of Gdansk, Poland +
+ e-mail:, PGP key available +
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