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headphone jack humming noise on Surface Pro 8 depending on fan speed


New Member
I noticed that the 3.5mm jack output on my Surface Pro 8 is humming. However, it only hums when the fans are on, so it's under load, and the audio output is "on", meaning when I'm playing or have just been playing some audio (doesn't matter, software, VLC, browser, game). The hum is in the range around 150 Hz and the pitch of the hum depends on fan speed, which is very curious. It hums on the power supply as well as the battery. The headphones are not the problem, several have already been tested.
Can anyone test this as well and confirm? Maybe with an online stress test for the cpu, wait so the fans ramp up und then listen closely after playing some audio...