OLED CX and G-sync problem

[Morgan76510]

Hello, I'm talking to you, because I recently bought a TV lg oled cx55 for my computer with the brand new 3090 hdmi 2.1

I am very annoyed about some things and that makes me hesitant to keep the TV or not.

First of all I have the last update 3.11.25, but I still encountered some big problems at the beginning and then just one at the moment which disturbs me especially the very first one was changes in brightness ( Video: https://we.tl/t-1crwnWSrNH) you can't see very well with the laptop, but otherwise it was like flickering or flickering white light through the slab, Flickers among others ONLY when G-sync was activated it was for example on Dead by daylight, after having put G-sync in full screen mode and not the second option windowed in the nvidia panel this problem has more or less disappeared (relief).

But now I have a problem that persists and it does it on all games except strangely on Dead by daylight or when G-sync is activated and I exceed 100FPS it creates artifacts on the screen (video: https://we.tl/t-PpGHUhUA6Q ), pixelized vertical lines that appear randomly on the screen at first, it used to make me feel it a lot, now less (I didn't understand why), but it does it anyway and especially in game loading or main menu, in games it's much less frequent even though I exceed 100fps. On resident évil 3 it only does it to me when HDR is activated with g-sync if g-sync and there but no HDR then it's like dead by daylight on the other hand if I don't have g-sync and I put the HDR then it works too. When I deactivate g-sync it doesn't do it to me anymore and I can exceed 100fps without having its artifacts, as soon as I reactivate g-sync I am obliged to cap at 100fps in my nvidia panel then to cap at 97fps on RTSS. Moreover if I cap with RTSS and leave the nvidia panel at 120hz can I cap RTSS at 100fps instead of 97 since the sync will not be activated?

A software update was released in Korea 03.11.26, but is no longer present on the site, do you think the problem really comes from the screen and the software? My card (3090) or a processor bottleneck that exceeds 100fps ( i78700k ) ? I bought 2 different HDMI 2.1 3 meters cables on Amazon I'll get them soon, because I have this one now https://www.amazon.fr/gp/product/B0869R ... UTF8&psc=1 and manufacturers often abuse HDMI certification by marketing I bought those https://www.amazon.fr/gp/product/B07GYW ... UTF8&psc=1 and https://www.amazon.fr/gp/product/B08CZN ... UTF8&psc=1 will see us if it comes from there.

In any case I hope it's a software problem is that they will fix it, because I still have a few days to return it and it bothers me to cap it at 97fps instead of 117fps, it's mostly because I'm afraid that it will damage my hardware with time?

Thanks for your help.
I'm very grateful for your help.

[jorimt]

first one was changes in brightness ( Video: https://we.tl/t-1crwnWSrNH) you can't see very well with the laptop, but otherwise it was like flickering

LG is aware of this issue. G-SYNC mode affects the panel's gamma at different framerates, as it adjusts the refresh rate. There is currently no fix.

But now I have a problem that persists and it does it on all games except strangely on Dead by daylight or when G-sync is activated and I exceed 100FPS it creates artifacts on the screen (video: https://we.tl/t-PpGHUhUA6Q ), pixelized vertical lines that appear randomly on the screen at first

I'm not sure, but that looks like a cable issue.

A software update was released in Korea 03.11.26, but is no longer present on the site, do you think the problem really comes from the screen and the software?

LG removed 03.11.26 and rolled it into a new version of 03.11.25. If you have .25, you have the latest update.

As for the problems, yes, some of them come from the CX and the firmware. LG is aware and is still planning on fixing some of the issues. Others are related to hardware, and may not be fully fixed though.

In any case I hope it's a software problem is that they will fix it, because I still have a few days to return it and it bothers me to cap it at 97fps instead of 117fps, it's mostly because I'm afraid that it will damage my hardware with time?

It won't damage your hardware.

Finally, there are other owners discussing the G-SYNC issues on the CX here:
https://www.avsforum.com/threads/2020-l ... c.3138274/

[Morgan76510]

Thank you for your answer, I just tried another cable the artifacts are still present, if I increase the graphics and I go below 100fps it disappears I also noticed that the change in brightness of the gamma on the black was present beyond 100 fps below it is much less visible see invisible (but present ...).

Your opinion knowing that the ASUS/Acer IPS 32inch g-sync ultimate hdr 1400 144hz, etc. will be released in early 2021 do you think that the CX is still the best to play ?

Other optional things you set the resolution to 4096 or 3840? Windows recommends 3840 so I'm not sure.

Is otherwise for marking you turn off the TV every time you leave 5m? Because I've heard that like computers turning off and on again with the sudden change in temperature can be considered as a batting blow in the components. That's why when I go away long enough I put my computer on standby and turn it off completely only when I go to sleep. For televisions I do not know if the Windows screen saver ballet lines for example could be enough to avoid markings (I set it to 1m) when we are away or should we turn off the TV completely (standby which for me is not really a standby).

[Chief Blur Buster]

Other optional things you set the resolution to 4096 or 3840? Windows recommends 3840 so I'm not sure.

The panel native resolution is 3840x2160. If you're scaling for improved frame rate, use 1920x1080. If you're using NVIDIA DLSS 2.0, you can use 1920x1080 as the base resolution and DLSS 2.0 into 3840x2160.

RTSS capping is very accurate (microsecond best-effort), so capping to 99 or 100 while keeping the panel to 120 is probably sufficient.

120Hz is lower input lag, since refresh cycles are transmitted over the cable in 1/120sec (at 120Hz) instead of 1/100sec (at 100Hz) no matter what RTSS cap you use for whatever refresh rate.

However, there might be other unintentional benefits (e.g. different gamma bug behaviors at 100Hz vs 120Hz) which I may not be currently aware of. So one, could test both ways and see if the quality differs. If no difference, then use 120Hz due to lower latency.

[jorimt]

Your opinion knowing that the ASUS/Acer IPS 32inch g-sync ultimate hdr 1400 144hz, etc. will be released in early 2021 do you think that the CX is still the best to play ?

That depends on your goals. The ASUS and Acer will be much more expensive than the CX (probably double the price) at launch, and they won't have perfect blacks or an infinite contrast ratio either.

They will however have a G-SYNC module, which will avoid some of the issues the CX is having with VRR currently.

Other optional things you set the resolution to 4096 or 3840? Windows recommends 3840 so I'm not sure.

3840.

For televisions I do not know if the Windows screen saver ballet lines for example could be enough to avoid markings (I set it to 1m) when we are away or should we turn off the TV completely (standby which for me is not really a standby).

OLED can get permanent image retention if you keep static or repetitive images on it for a long time. It's best to turn it off when not using it.

if I increase the graphics and I go below 100fps it disappears I also noticed that the change in brightness of the gamma on the black was present beyond 100 fps below it is much less visible see invisible (but present ...).

However, there might be other unintentional benefits (e.g. different gamma bug behaviors at 100Hz vs 120Hz) which I may not be currently aware of.

Latest news on this is that apparently OLED will require a form of variable "overdrive" during VRR operation to avoid gamma shifts:
https://www.oled-a.org/lgersquos-48rdqu ... _9620.html

LG will have to create multiple gamma curve presets depending on the current variable framerate, and this may require hardware, not software adjustments to achieve, which means it probably won't be fixed until the C11 onward.

[Morgan76510]

Thank you for your answers

That depends on your goals. The ASUS and Acer will be much more expensive than the CX (probably double the price) at launch, and they won't have perfect blacks or an infinite contrast ratio either.


They will however have a G-SYNC module, which will avoid some of the issues the CX is having with VRR currently.

After this problem, starts to be visible around 80fps and really seeing above 100 fps to this are added the pixelized artifacts. I'm trying to upscale the in-game resolution to be between 60 and 90fps and use the card at 100%, but the best, I think, is to cap it at 100fps and if I see that it's too conspicuous I cap it at 80fps.

But it's a shame, because without the g-sync VRR the game still loses fluidity and the graphics are not the same I noticed.
I've enabled in case the Windows 10 GPU scheduler and disabled the Windows 10 VRR when g-sync is enabled.

Is if I decide to disable it to go to 120fps ( with vertical sync enabled in the nvidia panel and the one in game disable it ? ) When you don't have G-Healthy then you don't need RTSS anymore?

For you better deactivate the VRR g-sync 60-80fps or have an image at 120fps in terms of fluidity?

3840.

Thank you, I figured that the 4096 add can be graphics with no compensation in exchange, so if I'm advised to use the 3840 I'll still listen to it to avoid future problems.

OLED can get permanent image retention if you keep static or repetitive images on it for a long time. It's best to turn it off when not using it.

Yes that's why the Windows screensaver is always moving, but if you tell me it's better to shut down completely I'll do it.

Latest news on this is that apparently OLED will require a form of variable "overdrive" during VRR operation to avoid gamma shifts:
https://www.oled-a.org/lgersquos-48rdqu ... _9620.html

LG will have to create multiple gamma curve presets depending on the current variable framerate, and this may require hardware, not software adjustments to achieve, which means it probably won't be fixed until the C11 onward.

Do you know when the c11s are likely to come out? Because if the oled in spite of their RVR problems are still the best screens on the market including compared to Samsung or Sony I think I'll keep it anyway, but I'm still hesitating...

[jorimt]

if I decide to disable it to go to 120fps ( with vertical sync enabled in the nvidia panel and the one in game disable it ? ) When you don't have G-Healthy then you don't need RTSS anymore?

If you use G-SYNC off + V-SYNC on, and your framerate can exceed your refresh rate, you still need an FPS limit to avoid V-SYNC input lag.

View those methods here:
https://blurbusters.com/howto-low-lag-vsync-on/

Do you know when the c11s are likely to come out?

They haven't been announced yet. They would be next year's model. There's no guarantee G-SYNC would work perfectly on them either though.

[Morgan76510]

If you use G-SYNC off + V-SYNC on, and your framerate can exceed your refresh rate, you still need an FPS limit to avoid V-SYNC input lag.

View those methods here:
https://blurbusters.com/howto-low-lag-vsync-on/

Thank you so much I got 199,882 with the link test. I tried to put 119.872 on RTSS but I can't get it to work so it marks 300 when I validate or 119 so I left it at 119.

After with the 3090 I'm capped on a lot of games but other games or I'll never cap at 120 so I'm not sure if it's still useful the v-sync on nvidia > RTSS 119fps.

In any case if the VRR is there I try to limit it to 80fps to avoid flickering with the v-sync on nvidia and v-sync off games.after review the g-sync on dead by daylight is just horrible I took it all off so much it was jerky !

For the other games it's more fluid but I think I'll remove the VRR in any case and keep only for the greedy games.

Thank you for all your valuable answers.

[Morgan76510]

It looks like LG will release a firmware https://www.youtube.com/watch?v=XOhV0jCB6YU 03.21.03 in the near future is that it will fix the baying worries horribly hoping that the flicker and artifact will be removed too!

[Chief Blur Buster]

Thank you so much I got 199,882 with the link test. I tried to put 119.872 on RTSS but I can't get it to work so it marks 300 when I validate or 119 so I left it at 119.

After with the 3090 I'm capped on a lot of games but other games or I'll never cap at 120 so I'm not sure if it's still useful the v-sync on nvidia > RTSS 119fps.

Capping FAQ: The Right Cap For Right Sync Technology/Issue
For G-SYNC, use bigger differentials (3fps below)
For Low-Lag VSYNC, use tiny differentials (0.01fps below)
For RTSS Scanline Sync, use no differential
For LG C9 G-SYNC Fix, use massive differential (~20fps below)

Do not mix up the cap differentials!!!

So try using 99fps RTSS cap for LG C9 G-SYNC.