I know there another about this but I've known about this problem for 3 years now and I was wondering if LG has an official support forum where people can post bugs so they at least have a chance of being fixed?
The problem being that EDID that is passed from the TV to any device connected to it does not include the AUDIO FORMAT information from the device on the eARC (HDMI2) of the LG devices.
This seems to affect everything from blu-ray players to PC's to DVD players, so it is not just a 1 type of hardware issue but the issue seems to be with the way eARC is handled. It also does not seem to matter about the hardware connected, whether it is a LG sundbar, or a Sony Receiver, or a Yamaha Receiver, etc... It just does not pass any capabilities of the device on the audio return channel.
This has been a documented problem for like 3 maybe 4 years now and everyone knows about, there are even websites dedicated to help you fix it, but my real question is how does one person submit this as a bug to LG to get some kind of attention to the issue?
Here is one of the websites that are dedicated to explaining the problem and the work around.
https://www.gamerevolution.com/guides/660948-how-to-get-pc-surround-sound-to-work-with-earc
I would really love for this to be fixed as it is really a huge frustration that I can't just use eARC the way it was supposed to be used.
And yes, I have documented this and captured the EDID from the TV on every HDMI port to make sure it wasn't just one channel, and every time LG OLED TV sends the EDID to the downstream device it always reports itself as "2 channel LPCM" , aka stereo, and the only way I have solved this problem, at least on PC's is to capture the EDID from the receiver and add the missing data blocks and force the platform to use my substitute EDID, and as you know, you can't do this on a Blu-ray, or a DVD player, or a game console (as far as I know).
So maybe if enough of you speak up or know how to forward bugs to LG Engineers, maybe it would get a priority and fixed, but as it is now, it is a complete mystery on how to get this problem noticed by LG.