Since tvOS 18 update Apple TV 4K and Apple TV HD output only stereo despite 5.1 selected

Went to watch a movie tonight and discovered I’m also only getting stereo in all apps :(

ATV > LG oled > Denon receiver via ARC. It’s an older receiver that doesn’t support 4K hence why I’m using ARC. All my other devices work fine in the same scenario. So hopefully Apple fixes this ASAP.

I HDMI to tv and then eARC via HDMI to my DN1040. I experience this same issue.

if I HDMI to the DN1040 first and then TV I loose Dolby vision (and in some cases 4K altogether) but I can get multichannel LCM. Hence the splitter question.

Here, in Rio, Brazil

I have the same problem with my Apple TV FHD MODEL A1625after the update to tvIS 18.0 . My Pioneer Receiver show me only Stereo with my videos and shows from iTunes with 5.1 audio. Maybe after a new update…who knows?

I have had the same problem since the update. Support told me to do a firmware update on my receiver but no such update exists. I have a digital audio extractor because my surround receiver has HDMI pass thru only. I realize it is an older model but this is how it has worked for years. I know the problem is not with the extractor because I hooked up my Gen 1 Apple TV the same way and I had 5.1 surround. I used to work for a company called Tweeter Home Entertainment and I own pretty nice gear. The only thing that changed in my scenario was updating to OS18. Very frustrating.

I wonder whether disabling Change Format and re-enabling it then making the Dolby Digital 5.1 choice might be needed. If the TV automatically senses the audio input, then maybe it should be restarted also.

I forgot to mention that the YouTube streaming app was never affected by the issue. If you can find a video to play using the YouTube app that contains 5.1 audio, but you can't receive its 5.1 audio, that that would appear to confirm that the cause of the issue is something other than Apple TV.

My guess is that re-encoding from Dolby atmos to dts 5.1 is broken in tvos18 since streaming of original dts 5.1 is still working

No surround works whatsoever in my case. Not Atmos nor dts.

Checked everything and it’s the TV iOS 18 update. With millions of boxes apples c needs a hot fix for this one.

Slow horses with sub titles is not the same

No surround sound working with Apple TVos HD and 4k. Its been two weeks now and annoying to wait. Please support with another update, apple. Thank you.

Have just updated to 18.1 on one of my Apple TV´s. And it seems that it is still NOT working with Dolby Digital 5.1

The issue is now resolved. Apple TV update today solved the problem.