E8 HDR problems
Hello! I'm my parents' tech support, but I'm having some trouble. They recently purchased a 65" LG E8 4K HDR OLED etc. etc. TV, and were excited to try it with their 4K Blu-ray player. However, when plugging in a 4K Blu-Ray the player spat out a message saying "Please connect to a TV that supports 4K and HDR for the best experience." Okay, so the receiver doesn't do 4K properly, no big deal - unplug the receiver and plug the player directly into the TV. Bam, now 4K works... but only when manually selected from the player's settings menu. Setting it to "Auto" outputs at 1080p.
However, now we have issues with the HDR. The TV continually gives a prompt saying it will set the HDMI port to "Ultra HD Deep Color Mode," with the only option being "OK." The prompt cannot be cancelled or cleared in any way apart from actually turning off the entire TV. So you click "OK" and it stops detecting a signal from the Blu-Ray player. Alright, go into the settings and disable Ultra HD Deep Color Mode for HDMI Port 1 and - the prompt immediately appears again. The prompt appears no matter what HDR or Deep Color settings are selected in the Blu-Ray Player's settings menu, despite the "HDR" tag appearing in the top-right corner of the TV and LG's own website saying I shouldn't need to use UHD Deep Color if the source is an HDR source.
I tried two separate 4K UHD Blu-Ray Players (Sony UBP-X800 and Samsung UBD-K8500), manually changing both the output resolutions and HDR settings, which produced the same results with the UHD Deep Color prompt on the TV. I tried three different 4K Blu-Rays (How To Train Your Dragon, The Fifth Element, and Hacksaw Ridge), and all four HDMI ports on the TV. My initial assumption was that the cables were inadequate to properly display HDR content but these are nice cables, and I have additionally swapped out cables from a second setup that I know is working properly (my parents upstairs setup, with a Sony X-930E and another UBP-X800) and was met with the same issue, again on BOTH the Sony and Samsung players.
The TV is running Firmware 04.10.15. According to my parents, this issue did NOT occur prior to this firmware update.
I have tested:
Different Blu-Ray players
Different HDMI ports
Different HDMI cables
All produce the exact same results, an uncancellable "For an optimized viewing experience..." prompt with the HDR tag and the visually-apparent massive brightness increase that comes with properly functioning HDR.
TL;DR: HDR broke how fix, not hardware problem
Do you guys have any idea what is going on or how I might fix it?