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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: macro@ds2.pg.gda.pl, PGP key available +
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