I have my ATV4k hdmi to stage hdmi arc to tv sony.Since yesterday I own also a great B&O Stage and I'm very pleased with sound (for now used in table stand modes but will see if wall modes is even better).
I have connected my digital tv decoder directly to my tv (Panasonic FZ800 OLED) and the ATV 4K to the Stage and that is where the problem starts.
All my equipment is controlled by a Logitech Harmony Elite and because the Stage uses ARC of the tv the Logitech is also controlling the sound volume of the Stage so this is great!
The picture and sound is perfect from the ATV but the Stage isn't switching to the HDMI input of the Stage itself even if I wait for 5 minutes or so.
To be able to have the ATV on screen I need to putt the tv and Stage in Standby and power it up and then after some waiting the screen is there.
I have Vierra link on in the Panasonic and everything is working fine except this.
Is it better to connect the ATV to my TV and then the tv decoder to the Stage? (can only use 2 of the 4 HDMI's of my tv becuase it's hanging on the wall )
I have no problem. I use atv4k remote. In atv4k settings did you check parameters same things in tv setting cec switch off and on. With Sony you can select on off or both.
A question was it ok with atv hdmi to your tv without the stage. CEC was working ?
Did you check that your atv is updated ?
I have at4k. Is cec available for previous gen ? Not sure.
atv hdmi to your tv and then stage to your tv you will lost atmos and lpcm flow