However, I think that the issue is that CEC support has never been 100% reliable and interoperable. My TV is also made by Sony, which likely helps with compatibility. Probably all these devices work well with some TVs and not others, despite everything claiming to support CEC.
Frankly I find the technology to be a total mess, and there's no way to debug it.
You can disable this in config, but it's all-or-nothing: now the PS5 can't wake the TV at all.
Attempting to report the misbehavior to LG and Sony is like shouting into the void. They don't care, or it's the other entity's problem, or both.
Also my xbox turns on the TV, but that never turns on the speaker bar.
I think it depends on the equipment combination, and its state.
I'm able to send an Airplay stream to my AppleTV and it both turns on my LG television, and switches the input to the AppleTV.
However, if the TV is already on, and I send an Airplay stream to the TV it will not switch the input. Which I think is an OK measure if you have kids or roommates or the TV is in a public setting so that someone might hijack your viewing as a joke or to be annoying. My memory is that this used to be possible with an earlier model AppleTV, or an earlier version of iOS.
That said, ever since I attached a $23 no-name Chinese DVR to another HDMI input on the same LG TV, the AppleTV no longer has the ability to wake or change inputs. Very strange.
In my case, the TV is from 2015.
I know because my wife and I just happened to be in an electronics store when the Pope was visiting the United States in 2015, and it was on all of the televisions.
At the time, we had a 32-inch TV from 2003ish, and when my wife saw the Pope on the 65-inch screen in the store, she immediately grabbed a salesperson and said, "I want to see the Pope like that."
So, in case you've ever wondered if the programming on a TV in a store matters, the answer is "sometimes."
I have almost the opposite problem. Any time I turn on my TV and receiver to use another device (often my Nintendo Switch), the Apple TV somehow wakes up and then switches my receiver's input to itself. (My receiver is my HDMI switcher and has a single HDMI output to my TV.) This is a very annoying problem, and is the only reason I still need to have the receiver's remote nearby.
Another unrelated but incredibly annoying problem I have with this whole setup is that it's essentially impossible to play music through my receiver with my AppleTV without the TV being on. Turning off the TV will, of course, turn off the receiver too.
CEC won't work at all then of course, but it will fix that problem.
I don't have an Apple TV. Does it have a setting to disable CEC?
Oh? My Apple TV 4K (2021) turns on the TV and receiver when I start AirPlay, and the receiver switches the input to the AppleTV if it wasn't already on it. This works whether the TV+receiver were on or off. My TV is a Sharp from ~2013, and the receiver is a Yamaha also from around the same time.
Like if I press it once, the ATV wakes up and usually the TV does, but often showing the wrong source. 5x fast consistently wakes the TV to the right input.
Chromecast with Google TV contains an IR emitter to handle that, and IR is the default not CEC.
On the same topic, I once bought a vacuum cleaner on which they wrote on the box « ExtraRangePlus (R) TM: Up to 12m power cable length ». Just why !?
My Apple TV 4K wakes my TV and to the right input with Airplay though!
I don’t know if there are switches capables of turning on and off the TV based on the presence or lack or signal but that could be the ultimate solution to this issue.
I'm surprised that they'd get it wrong though given that they've properly supported the HDMI VRR and ALLM features since the Xbox One X. (AFAIK Sony doesn't have either of those, even on the PS5. And with Nintendo it's surprising they have any CEC support at all)
That seems to be the main use case, but instead the design forces every source to be a universal remote control.
In a dark room, you can still see a dim glow coming from the LCD panel that only goes away if I press the power button on the Samsung remote.
- Apple: When you start an Airplay stream on your phone directed at an Apple TV, the Apple TV doesn't send a switch input command.
- Nintendo: The Nintendo Switch switch input command when waking from sleep is unreliable at best.
- Microsoft: Surprisingly the worst offender. The only switch input command it ever sends is when it wakes from user-induced sleep. If you let the console go to sleep on its own, and wake up the controller and press the big Xbox button, it never sends a CEC command.