Much as it pains me to write this, I discovered last night (Far too easily I might add) that my LG C8 does indeed have elevated blacks with Dolby Vision content over HDMI. My tests so far have only been with my Apple TV 4K box. I first tried Blade Runner 2049 and I could tell immediately the black bars were not quite black. With how easy I saw it last night, I don't know how I missed it before other than the fact that I wasn't "Looking" for it. But now it's one of those things I can't unsee. I sit pretty far back from my 65 inch TV, further back than is really ideal, about 13 feet but I could still see it easily.
After BR2049, I tried Mute on Netflix as someone recommended and I could see it there too.
Once I discovered it, I was experimenting with my picture settings (For DV content, I've been using Cinema Home.) I notice that simply changing brightness from 50 to 49 made the blacks completely black again. (I could tell the pixels making up the black bars went "Off" once I changed it to 49.) As easy as I fix as that was, something tells me it's not that simple. Am I right? What is the downside to changing my brightness to 49?
mentioned in this thread, and as I have seen mentioned elsewhere after some googling, that one solution is to change the sub brightness to 127 and then change all your picture mode brightness settings up by 1. I briefly played with the sub brightness and it did not change anything it seemed. Am I missing something? Do I need to change the contrast too?
I'd really love it if someone could explain what the sub brightness is and why lowering it by 1 and then upping the regular brightness by 1 helps things. Wouldn't doing those 2 actions cancel each other out? What happens if you just change sub brightness to 127 and don't do anything to the user facing brightness setting?
I just got an x800m2 that I have watched about 5 minutes of a movie on so far. If I understand correctly, it will very likely solve this issue at least as far as disc based content goes so that's good at least. I have not been sure if I am going to even keep that player but if it does indeed fix the DV issue, that will definitely push me into the "Keep it" category.
Since I am a glutton for punishment, I am going to plug my UBK90 back in tonight and see what the black levels look like on my Dolby Vision UHD discs. Could be I have been watching Dolby Vision discs with elevated blacks for 6 months and not even been aware of it. So basically the entire time I have been watching 4K content. Haha!
I'm curious for those who have the DV issue, what have you done to resolve it? Sorry for all the questions.