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But also, why does the cursor randomly move like a we g bored? I understand algorithms and computer problems quite well but it's really creepy sometimes. One is sound, but the other is a different controlled visual manipulation.eARC (enhanced Audio Return Channel) is an audio thing. A very simple explanation is it allows audio to be passed from a device, like a Xbox, through your tv (or other device) to you audio system.
HDMI CeC (consumer electronic control) is what allows the feature OP explained.