Messages in this thread | | | Date | Thu, 29 Apr 2004 13:54:46 +0200 (CEST) | From | "Maciej W. Rozycki" <> | Subject | Re: IO-APIC on nforce2 [PATCH] + [PATCH] for nmi_debug=1 + [PATCH] for idle=C1halt, 2.6.5 |
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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 + - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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