Dang this PS5 haywire my LG CX CEC last night =.=
Thought apa jadi everything cannot work (even factory reset my TV and soundbar )
Issue : turn on xbox or apple tv will not trigger tv and soundbar to turn on
Issue #2 : even everything manual turn on, i also cannot change the volume using either one controller - apple tv remote or lg magic remote
Note that everything has CEC turn on and works well
Only PS5 is recently connected (direct to TV) but without HDMI link turn on cause i dislike it since PS4 era.
Unplug TV from wall plug and unplug all hdmi connection and leave it 30 minutes and plug everything back still same issues.
In the end test every hdmi port one by one (plug in and out) and find that it's PS5 the culprit
Question: is it if i want to use HDMI-CEC properly, i must turn on every devices' CEC that are connected to TV ?
Try take a spare or cheap hdmi cable and prick/plug the CEC pin on the hdmi connector. Google the pin position, it will show. Then try plug back ur ps5. Just need to prick one side.
Used to had this issue with my astro to my a80j and apple tv to my old sony lcd.