https://www.makeuseof.com/fix-static-no ... ers-linux/
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cat /sys/module/snd_hda_intel/parameters/power_save
It might be related to Power Saving Mode.
I found that in the MX-19 the value was 0, while in the MX-23 from liveUSB it was 1.
But I would have to try it for a longer period of time, because the whistling occurs only occasionally, randomly...