Question System sound gets fed into mic channel after connecting headphones


Aug 22, 2017
I have an issue where when I connect my headphones to PC it starts feeding system sound to mic. So if I call someone from PC they can hear my system sound, even if I mute my headphones using physical button it doesn't stop feeding the sound.

On PC: If I start OBS studio and disable recording system sound. Mic recording is on but I turn off mic using physical button on headphones. System audio is still fed into mic channel and gets picked up by OBS. It only stops if I unplug headphones. I have tested two headphones andboth behave same, right now I am using Razer Kraken with 3.5mm jack. My onboard sound card has stopped working and I have two USB sound card, both behave same. (One is cheap non-branded and other one is Sabrent)

On Mobile: I tested on Asus Zenfone Max Pro M1, it feeds mobile sound into mic but Mi mobile doesn't feed system audio into mic.

So it seems issue with my mobile and PC rather than issue with headphones or sound card. I believe many people must have faced this issue, any settings I can tweak on PC to disable this behavior? Would be great if there is solution for mobile as well.