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4K @120hz HDR/VRR

Leyasu

Banned
This would be an appropriate thread for this question I think, I've got an LG 65CX and a RTX3080 connected together with a HDMI 2.1 cable. It seems to work fine most of the time, a few handshaking issues now and then but on the whole it's ok. But on certain dark screens I notice the screen is flickering, wasn't there something to do with lowering the refresh rate slightly to 119hz or was I imagining that?
That was one of the problems that has been highlighted. Apparently it is something to do with the Gamma curves. Try disabling VRR or GYSNC on your grfx card
 
D

Deleted member 17706

Unconfirmed Member
Honestly if 120fps 4K hdr 10 bit 4:4:4 is what you want, you pretty much have to go CX

Good to know. That's basically the best one if you want all of that, then?

I'm thinking about upgrading from my LG B6 and definitely want a model that can do 120 fps variable refresh, 4K resolution, and HDR at the same time.
 

b0bbyJ03

Member
This would be an appropriate thread for this question I think, I've got an LG 65CX and a RTX3080 connected together with a HDMI 2.1 cable. It seems to work fine most of the time, a few handshaking issues now and then but on the whole it's ok. But on certain dark screens I notice the screen is flickering, wasn't there something to do with lowering the refresh rate slightly to 119hz or was I imagining that?

I've got a 48" CX and a 3080 and I turned off Gsync. I read that there are issues with Gsync still. I noticed that it's not smooth, even at high frame rates. I'm running most games well over 4k 100 fps and as soon as I turned off Gsync everything became butter smooth. I looked it up and read that they promised a fix before the end of the year. With high fps you can't really notice any tearing or anything anyway.
 
That was one of the problems that has been highlighted. Apparently it is something to do with the Gamma curves. Try disabling VRR or GYSNC on your grfx card
I've got a 48" CX and a 3080 and I turned off Gsync. I read that there are issues with Gsync still. I noticed that it's not smooth, even at high frame rates. I'm running most games well over 4k 100 fps and as soon as I turned off Gsync everything became butter smooth. I looked it up and read that they promised a fix before the end of the year. With high fps you can't really notice any tearing or anything anyway.

Thanks turning off G-Sync has stopped the flickering, I really hope that there's a fix incoming for this.
 

MarkMe2525

Member
I have been reading the last couple of days that some tvs are struggling with those settings, and that the LG OLEDS are having a problem with the gamma too.

I have a 2020 Samsung Q80T, and apparently those are having display problems also. But on the other hand, I have read about people on 2020 LG nanocells that don't have problems and people with 2020 sony tvs also saying that everything is fine.

I will be picking up my console in a couple of hours and will report back my findings. But if anyone else is having problems or not, please post them.

I have a q70 and its running great at 4k HDR VRR 120hz. Its the first time I have gotten to use the features.
 
On my LG E9, the update fixed the gamma but I had to turn off VRR because at 4k 120, VRR causes signal loss on my panel. With VRR off, 4k 120 HDR with no issue
 

dave_d

Member
My issue is I have my XSX hooked up to my C9 through a switchbox and while it supports 4k it doesn't support 120hz. I'll have to try hooking it up directly tomorrow or something.
 
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Kagey K

Banned
Yeah it is quite depressing. TV manufactures just can't get it working well.



Sonys x900h (xh900x in europe) 120Hz mode seems to be there for PS5, so it seems they ignored the HDMI 2.1 specification just to get it working. But it should be updated in the next few month ... well I guess this means years or never.

There was an update this week for LG. That video needs to be retested as the info is outdated.
 

sixamp

Member
My 85series nano cell and my brother in law's nano cell are having issues. First it was green screens when loading games, the they wouldn't recognize a signal and for some reason it we look up or there's a dark scene the tvs starts flickering
 

Kagey K

Banned
My 85series nano cell and my brother in law's nano cell are having issues. First it was green screens when loading games, the they wouldn't recognize a signal and for some reason it we look up or there's a dark scene the tvs starts flickering
Hard reset should fix it. It’s always been my go to, especially with green screen shit.

Hold down the power button for 7-10 secs and boot it from scratch. (Assuming you are talking about Xbox) otherwise it could be a problem with nano cell tvs (I know absolutely nothing about them)
 
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sixamp

Member
Hard reset should fix it. It’s always been my go to, especially with green screen shit.

Hold down the power button for 7-10 secs and boot it from scratch.
Ty but we both tried it. The green screens only happen when a game is loading, otherwise it's fine. But the screen screen will sit there for a bit then change to the games
 

Hakiroto

Member
I see a lot of people saying it's working without problems (not just here but on other sites, too) but I'm not sure if that's them just enabling VRR, seeing a picture, and saying there's no problem or if it's actually them doing that and then looking to see if the gamma issue is visible. It feels like the former but it's hard to know.
 

Kagey K

Banned
I see a lot of people saying it's working without problems (not just here but on other sites, too) but I'm not sure if that's them just enabling VRR, seeing a picture, and saying there's no problem or if it's actually them doing that and then looking to see if the gamma issue is visible. It feels like the former but it's hard to know.
There was an update this week. So both can be true, before the update it might have been a problem. Now there might not be.

I don’t have my system yet, so I can’t test it personally.
 

Hakiroto

Member
There was an update this week. So both can be true, before the update it might have been a problem. Now there might not be.

I don’t have my system yet, so I can’t test it personally.

Thanks for the reply. Yeah, I also don't have mine yet either (it arrives tomorrow). It'd be great to hear from somebody who noticed the issue and has now updated.
 

Leyasu

Banned
I see a lot of people saying it's working without problems (not just here but on other sites, too) but I'm not sure if that's them just enabling VRR, seeing a picture, and saying there's no problem or if it's actually them doing that and then looking to see if the gamma issue is visible. It feels like the former but it's hard to know.

My Samsung got an update monday night.

Anyway, I am no pro, but I do have an idea of what I am talking about and I tried everything. Switched on and off VRR/HDR and gone between 60 and 120hz, and haven't noticed any changes.
 

noise36

Member
I loaded Ori on the XSX on my C9 and it said 120hz 4K not detected and set it to 4k super sampled.

I could go in and choose 120hz 4k mode manually and I could play the game but no idea if it was 120hz.
 
Strange, my 2019 B9 handles VRR just fine from an XSX 4k@60fps, perhaps you can elaborate?

VRR fucks with the near black gamma values on 2019/2020 OLEDs. Best case you "just" get a little brighter more greyish blacks, worst case you get flickering parts on the screen.
This gets worse the lower the VRR has to regulate the HZ. So ironically now you need higher fps to have a stable/good image which is exactly what VRR was supposed to fix to get around VSYNC.
It´s also not patchable by just rolling out new gamma curves in the firmware as it`s a major oversight on pixel-control level. And since LG provides the panels for all other manufacturers......well.
Maybe Panasonic will get around this as they are one of the very few who make their own low level PCBs, but in general VRR will drag down the picture quality on all oleds until new panels come out.
 
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Leyasu

Banned
I loaded Ori on the XSX on my C9 and it said 120hz 4K not detected and set it to 4k super sampled.

I could go in and choose 120hz 4k mode manually and I could play the game but no idea if it was 120hz.
Have you set your console to 120hz?
 

shimceltic

Neo Member
A quick update.

Just played gears 5 at 120hz and it was pretty damn amazing. Smooth as silk and no problems on Samsung Q80T.
What size? Just got the 49 and collecting this evening. Do you have to do anything once enabling vrr on the series x?
 

Leyasu

Banned
What size? Just got the 49 and collecting this evening. Do you have to do anything once enabling vrr on the series x?
I have the 55".

Nope, just activate game mode on the tv, then just check the boxes in the console and you are good to go dude. Make sure that you do the firmware update on the tv to.

Enjoy, although not top of the range, the Q80T is pretty decent tv that does nice HDR and is smooth for gaming. Enjoy!!
 

noise36

Member
Have you set your console to 120hz?

Probably not , I just assumed it would auto switch when required if your tv was compatible. Will have a look shortly 😊

Edit: my C9 is wall mounted so not using the supplied HDMI cable which is a problem because I am losing picture when I launch a game in 120hz mode.

Need to find some HDMI 2.1 cables to run through my wall.
 
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mitchman

Gold Member
VRR fucks with the near black gamma values on 2019/2020 OLEDs. Best case you "just" get a little brighter more greyish blacks, worst case you get flickering parts on the screen.
Yes, I'm aware of this issue and I don't really see it here. I imagine a near-stable 60fps will not trigger this as much as an very unstable 120fps, which is where I heard this was more of a problem.
 

DanEON

Member
This gamma issue is over blown. I have been using VRR on my C9 for over 12 months and never even noticed this, and I am a stickler when it comes to things like this. I have had multiple TVs professionally calibrated.
Agreed. You can barely notice it, only if you really look for.
But, if you have the gamma flickering (I dont) then its really annoying
 

shimceltic

Neo Member
I have the 55".

Nope, just activate game mode on the tv, then just check the boxes in the console and you are good to go dude. Make sure that you do the firmware update on the tv to.

Enjoy, although not top of the range, the Q80T is pretty decent tv that does nice HDR and is smooth for gaming. Enjoy!!
Just turned mine on, xbox is saying TV doesn't support 120hz and I can't find the option for game mode.
 
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Leyasu

Banned
Just turned mine on, xbox is saying TV doesn't support 120hz and I can't find the option for game mode.
Ok, game mode is in the 3rd or 4th menu down in the settings. You will have to select input signal plus too. If I remember correctly, I think that the 49” tv has a 60hz panel
 

shimceltic

Neo Member
Ok, game mode is in the 3rd or 4th menu down in the settings. You will have to select input signal plus too. If I remember correctly, I think that the 49” tv has a 60hz panel
Yes I've just found out the 49" is a 60hz panel. Not sure how it can be sold on the same model as 120hz panels.
 

dave_d

Member
So I've plugged my XSX directly into my 55" C9 at it does work in 120hz mode when I select that option. I turned off VRR but I haven't tried it yet. Guess I'll try Gears of War 5 and see what that's like.
 

Shai-Tan

Banned
VRR fucks with the near black gamma values on 2019/2020 OLEDs. Best case you "just" get a little brighter more greyish blacks, worst case you get flickering parts on the screen.
This gets worse the lower the VRR has to regulate the HZ. So ironically now you need higher fps to have a stable/good image which is exactly what VRR was supposed to fix to get around VSYNC.
It´s also not patchable by just rolling out new gamma curves in the firmware as it`s a major oversight on pixel-control level. And since LG provides the panels for all other manufacturers......well.
Maybe Panasonic will get around this as they are one of the very few who make their own low level PCBs, but in general VRR will drag down the picture quality on all oleds until new panels come out.

yeah, I don’t think it’s the end of the world though. One of my pc monitors is VA LCD and it also has a similar flickering problem with Gsync. I still prefer it with it on, although I might turn on adaptive vsync so it only rears its head when I’m under 60fps.
 
Well this is now a complete mystery, I upgraded my PC yesterday and did of course a total rebuild / reinstallation. ASUS RTX3080 and LG 65CX with HDMI 2.1 cable and the latest Nvidia drivers 457.30. Now I don't even get the option for 120hz on the TV, it's locked at 60 or below. WTF am I doing wrong here?
 

Jigga117

Member
Well this is now a complete mystery, I upgraded my PC yesterday and did of course a total rebuild / reinstallation. ASUS RTX3080 and LG 65CX with HDMI 2.1 cable and the latest Nvidia drivers 457.30. Now I don't even get the option for 120hz on the TV, it's locked at 60 or below. WTF am I doing wrong here?
Is your hdmi port set to deep color?
 
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