[Bug 210993] Intel frequency scaling causes electrical noise on 10th gen CPUs

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https://bugzilla.kernel.org/show_bug.cgi?id=210993

--- Comment #10 from Karol Herbst (karolherbst@gmail.com) ---
(In reply to Francisco Jerez from comment #7)
> (In reply to Karol Herbst from comment #6)
> >
> > > Does disabling some specific idle state (e.g via
> > > /sys/devices/system/cpu/cpu*/cpuidle/state*/disable) have any effect on
> the
> > > noise?
> > 
> > disabling all except state0 stops the noise.
> 
> Ah that makes sense, that sounds like the culprit might be a noisy power
> supply coupled to the oscillation of the processor's current draw caused by
> repeated C-state transitions.  If that's the case you may be able to tweak
> the latency parameters to make sure the oscillation frequency is outside the
> audible range, though I'm not sure if it would make sense to upstream such a
> change since it will likely come at an energy cost (Though I would expect
> the cost to be minor as long as the processor can still reach the deepest
> sleep state in the steady state while idle, might be a good trade-off in
> your specific case if this is particularly annoying to you).

yeah... might be. Although it felt like this is a more common issue with newer
CPUs, especially 10th gen Intel CPUs and was wondering if there is a way to
mitigate it in software. Limiting the max clock helped to reduce it, so I was
wondering if there could be some nice ideas for people too lazy or not wanting
to bother with replacing the laptop or whatever.

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