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I started getting coil whine yesterday, after adjusting my fan curves. Not really sure why, but with the fans off the whine was far louder than keeping them on a low-speed minimum. It’s not fan noise blocking out the coil whine, because I still can’t hear the fans (they’re Noctua’s). I don’t know if it’s due to thermals, something to do with the power load, or what.

I’ll have to look at the polling rate thing, too - thanks for the tip.

I wonder if the vibrations from the fans cause the coils to change shape slightly, preventing them from supporting the higher frequency of coil whine?

I've also been hearing coil whine sound coming from MacBook's Caldigit dock when using a wired gaming mouse (only in totally silent rooms). I haven’t mentioned it in the article, but just like you said, lowering the polling rate fixes it too.

Same issue here on a MSI laptop, the weirdest thing is that the coil whine is louder when opening certain applications like the desktop client of Signal and HoneyView image viewer.

As far as I heard, it's related to CPU C-states.