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

--- Comment #7 from Francisco Jerez (currojerez@riseup.net) ---

(In reply to Karol Herbst from comment #6)

quoted

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).

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