Been banging my head against the wall since purchasing my HDMI 2.1 TV, biggest POS or so I thought. Anyway last night I was going through settings in my Marantz 5014 when I found “HDMI control” in the system settings of the receiver. I knew the TV had it but never occurred to check the receiver. Anyway I hope my foolishness helps someone else avoid putting a remote through your tv. RTFM