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LG 48CX

G-SYNC was never limtied to SDR.

Windows does not support HDR at 8-bit 4:2:0. The minimum for HDR is 8-bit RGB / 4:4:4 with dithering or 10-bit 4:2:0.

So does G-Sync work with HDR 4:4:4 now? Manually switching to something different every time I want HDR and G-Sync is kind if a no-go for me.
 
So does G-Sync work with HDR 4:4:4 now? Manually switching to something different every time I want HDR and G-Sync is kind if a no-go for me.

There was never any incompatibility between HDR and G-Sync that I know of. I've run 1440p 120hz RGB HDR with G-Sync on it plenty of times.
 
Getting ready to rock 3080 and CX48 tomorrow and double checking same settings.

For HDR 4K 120Hz gaming content, I need to apply HDR ON in the Windows Display settings and then in the nVidia Control panel Desktop color depth: 32bit, Output color depth: 10 bpc, Output color format: RGB and Output dynamic range: Full?

Anything else? If G-sync is enabled, VRR is activated automatically if the TV HDMI input is PC + Game mode?

For SDR content and general desktop, do I need to change HDR OFF in the Windows Display settings every time?
 
Right I've tried all settings I can think of trying to create any custom resolution above 60hz and it just blanks out. I've tried different scaling settings in the NVIDIA control panel including having the GPU scale and the display. It definitely isn't a bandwidth issue as it should have clearly been able to handle that before the firmware update. Personal opinion is that it is a strange HDMI 2.1 to HDMI 2.1 issue between the video card and the display. If custom resolutions work with the Club 3D adapter, it's got to be DP 1.4 related.

Either way, awesome display but I am know I am in the minority where the custom resolution is a deal breaker for me if I can't get it working correctly... Shouldn't be this hard. The only other thing I can think of is when you create a custom resolution in NVCP, I think it is trying to set it in the TV mode where all the 60+hz refresh rates are under the PC list of resolutions. Not sure if there is any other way to do this.

EDIT: Ok, been trying a ton of different custom resolutions and refresh rate. I've found that regardless of ANY resolution I try, it's the custom refresh rates that make it not function correctly. Definitely not a bandwidth issue or even a resolution/aspect ratio. Here are the list of settings I have tried, all result in a black screen

  • 2560 x 1440 @ 75hz
  • 2560 x 1440 @100hz
  • 3840 x 1600 @ 75hz
  • 3840 x 1600 @ 100hz
  • 3840 x 1600 @ 120hz
  • 3840 x 2160 @ 75hz
Yet if I choose any of the precreated resolutions/settings, they are work with the scaling settings in the NVIDIA control panel such as 2560x1440 @ 100 and 120hz, 2560x1600 @ 60hz etc etc.

View attachment 284235

Anyone else with a 3080/3090 willing to test this out? 3840x1600 not working at 120HZ would be super disappointing...
 
Didn't someone post a reply from an LG rep that 4k HDR RGB wasn't possible with G-Sync?

I can tell you that I have HDR 4k G-Sync working with No Mans Sky. Not sure about other games, but I can confirm it does work.

But, I do not enable HDR on the desktop. Only in the game do I have it enabled at 400 nits.
 
Just got my Club3D adapter. Anyone have the latest firmware update? 3080 won't show anything out of the box...

Since all the links seem to be expired, I put v1.02 and v1.03 up on Dropbox. https://www.dropbox.com/s/4cbxcf0fepsncx8/CAC-1085.zip?dl=1
Hook up the USB on the adapter to a USB port on your computer. You first need to install the billboard driver and then you can install the firmware. I would just go straight to v1.03 as it has worked fine for me.

Make sure you have set the following:
  1. Enabled the display in Windows.
  2. Set your HDMI input to PC mode from Home Dashboard.
  3. Enabled HDMI Ultra Deep Color for the input.
  4. Enabled Instant Game Response for the input.
If you get blank screen or no signal, remove the USB-C cable from the adapter and plug it back in. If you try to go to HDR mode at 120 Hz you might encounter an issue where it looks washed out. Switch to 4K 60 Hz and back and this usually fixes the issue.
 
If you have a 3080/3090. Is there any advantage using the Club3D DP adapter vs HDMI 2.1 8k cable ? Or it it for multi screen or for people with 2080s ?
 
Since all the links seem to be expired, I put v1.02 and v1.03 up on Dropbox. https://www.dropbox.com/s/4cbxcf0fepsncx8/CAC-1085.zip?dl=1
Hook up the USB on the adapter to a USB port on your computer. You first need to install the billboard driver and then you can install the firmware. I would just go straight to v1.03 as it has worked fine for me.

Make sure you have set the following:
  1. Enabled the display in Windows.
  2. Set your HDMI input to PC mode from Home Dashboard.
  3. Enabled HDMI Ultra Deep Color for the input.
  4. Enabled Instant Game Response for the input.
If you get blank screen or no signal, remove the USB-C cable from the adapter and plug it back in. If you try to go to HDR mode at 120 Hz you might encounter an issue where it looks washed out. Switch to 4K 60 Hz and back and this usually fixes the issue.

You are a rockstar kasakka! I really appreciate your prompt help! After updated my Club3D adapter to the latest, I am running 3840x1600@100hz as a test and it's working great on the 3080-- No GSYNC of course but buttery smooth compared to 60hz.

I haven't been able to test the 2080 Ti yet but I will. So odd that HDMI 2.1 to HDMI 2.1 won't work for custom resolutions over 60hz but DP 1.4 to HDMI 2.1 does work... but GSYNC doesn't? So odd.

EDIT:

Noticed that 3840x1600@120hz with Club3D adapter cuts off the edges of the screen:
1601510495356.png

Also gamma/brightness seems to be lower and mode is forced to RGB in NVCP...
 
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So are the Korean firmware for the various CX models, confirmed to be working on US/CAN models?

Has anyone rolled up or down from previous Korean firmware to a US firmware or vice versa?

I see a few people on here, on reddit reporting that it works for the LGOLED48CXPUA.
 
Finally got a 3090 coming Friday. Can't wait to at last use this display to its potential (and also not upgrade anything for a couple years).
 
If you have a 3080/3090. Is there any advantage using the Club3D DP adapter vs HDMI 2.1 8k cable ? Or it it for multi screen or for people with 2080s ?

The only reason to go DP1.4 over HDMI 2.1 would be if you need to drive multiple displays, since most 3000 series cards only have one (some two) HDMI 2.1 outputs. Not sure how that would work with VRR though...

But for a single display? There's no reason to bother with DP 1.4 that I can think of.
 
You are a rockstar kasakka! I really appreciate your prompt help! After updated my Club3D adapter to the latest, I am running 3840x1600@100hz as a test and it's working great on the 3080-- No GSYNC of course but buttery smooth compared to 60hz.

I haven't been able to test the 2080 Ti yet but I will. So odd that HDMI 2.1 to HDMI 2.1 won't work for custom resolutions over 60hz but DP 1.4 to HDMI 2.1 does work... but GSYNC doesn't? So odd.

EDIT:

Noticed that 3840x1600@120hz with Club3D adapter cuts off the edges of the screen:
View attachment 284405

Also gamma/brightness seems to be lower and mode is forced to RGB in NVCP...

Hmm I haven't noticed it cutting out the edges. Make sure Pixel Shift and Quickstart+ are off. I can double check later today.

Gamma and brightness also do not differ from HDMI on my 2080 Ti when running at 60 Hz. RGB is also not forced, I can run YUV444, YUV422 etc just fine. Will verify these things when I can get the firmware update for my model.

I have also tested the adapter on my C9 and that looked the same to me in all modes but I only tested for chroma subsampling. The C9 does not have the subsampling issue so no firmware fix needed there.

I think you should file a ticket to Nvidia in case this not working over HDMI is a driver bug. To my understanding the TV should not know any different.
 
Excuse me? 3 48" CX?
...pics?
I posted a pic of the rig on page 105, Sept 21st. I don't want to take up more real estate on the board posting it again.

BTW, my left CX48 is not lagging any more. Somehow the mode got turned off "game". This setup is rocking for me now in 7680x1440. I can't wait to upgrade to an RTX 3090 to really get it going, and try triple 4k. My SLI Pascal Titan XP's can't perform well enough for me there.
 
I can also confirm now that Horizon Zero Dawn with HDR + G-Sync works flawlessly after 3 hours (Wife is playing)

So, I think we can put that rumor that HDR + G-sync not working to bed.

Anyone having questions about that should make certain they are capping their fps 3 (up to 5 if necessary depending on some games) below the 120 top limit and keep their settings dialed in so that they don't ever drop beneath the bottom end of the VRR range in their frame rate graph. Specifically, never bumping down near 40fps or lower anywhere in their game's actual frame rate range throughout (not the frame rate average). I'd guess that would mean over 70fps average for some games, maybe over 55fps average for tighter ones, generally. The vrr range of the TV is 40 - 120.
 
Have something a bit confusing with my three CX48's after you guys have me checking LG Firmware.

My left and right TV's are on 3.10.41, but my center is on 3.00.70. I check for updates on the center TV, but 'No Updates Found'...
 
Anyone having questions about that should make certain they are capping their fps 3 (up to 5 if necessary depending on some games) below the 120 top limit and keep their settings dialed in so that they don't ever drop beneath the bottom end of the VRR range in their frame rate graph. Specifically, never bumping down near 40fps or lower anywhere in their game's actual frame rate range throughout (not the frame rate average). I'd guess that would mean over 70fps average for some games, maybe over 55fps average for tighter ones, generally. The vrr range of the TV is 40 - 120.

Yeah, the wide VRR range is one huge advantage over Samsungs QLED TVs for PC users, but I'd personally like if in the future LG and others could drop that minimum down to 30. But yes, if you go outside the VRR range performance will be a little messy since your defaulting back to standard Vsync.
 
Have something a bit confusing with my three CX48's after you guys have me checking LG Firmware.

My left and right TV's are on 3.10.41, but my center is on 3.00.70. I check for updates on the center TV, but 'No Updates Found'...

Check if they have different model numbers for some reason from the Support section. You can also update the firmware yourself with USB stick if you want. The process is this:
  1. Download firmware file from LG website. US firmware is not compatible with EU models so preferably use the region website.
  2. Use a USB stick formatted to FAT32 with more than 1 GB space.
  3. Create folder LG_DTV in its root.
  4. Extract firmware .epk file into LG_DTV folder.
  5. Connect USB stick to one of the TV USB ports.
  6. It should pop up a dialog about firmware update. If it doesn't, the firmware most likely is not compatible with your TV.
 
Yeah, the wide VRR range is one huge advantage over Samsungs QLED TVs for PC users, but I'd personally like if in the future LG and others could drop that minimum down to 30. But yes, if you go outside the VRR range performance will be a little messy since your defaulting back to standard Vsync.

80 fps average would be dead center between 40 and 120 so 75+ , 80fps average is probably a safe bet. Some games stay within a +/- 15fps range from average so you could get away with around 60fps average on those I guess.

Personally I don't think you are getting as appreciable of a performance/aesthetic increase out of a 120hz monitor until you dial in at least 100fps or 110fps average though, in regard to blur reduction or motion clarity increase and motion definition and pathing increases.

(70) 85fps <<<<< 100fps >>>> 115fps (130fps)

which is something like:

25% improved smearing FoV movement?? <<<<<< 40% blur reduction + 5:3 motion def increase >>>>>>> ~ 50% blur reduction ("fuzzy" blur) + 2:1 (double) the motion definition/smoothness

When you are at 120hz on a desktop you are always at 120fps solid, where people like to see their mouse movement and window dragging so much smoother. Once you cut down too much from 120fps solid (117 capped) goal in games, your 50% blur reduction/ +50% clarity increase is reduced and you aren't getting double the motion frames thoughout your graph anymore either... and that low end of the frame rate graph is usually in long views in game worlds, long vistas etc and importantly, in periods with combat and FX firing which tanks your frame rate.

sub 60fps is absolutely chunky e.g. 30fps. I play bloodborne on ps4 from time to time and it's quite a transition to digest even if coming from a 60fps (solid) souls game like dark souls 3 or Nioh on pc. Even just the character animations aside from the FoV movement are quite chuggy. Nioh and DarkSouls3 are playable at 60fps solid with no dips, graphics cranked. I'm looking forward to some of the newer souls-like games (and assassin's creed valhalla with souls-like stamina system supposedly) on the OLED eventually for the glorious black depths, 4k rez, and the fact that some of the newer ones are 120hz capable. It's too bad interpolation causes input lag. A 60fps game would really benefit from increased frames on a 120hz display.
 
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sub 60fps is absolutely chunky e.g. 30fps. I play bloodborne on ps4 from time to time and it's quite a transition to digest even if coming from a 60fps (solid) souls game like dark souls 3 or Nioh on pc. Even just the character animations aside from the FoV movement are quite chuggy. Nioh and DarkSouls3 are playable at 60fps solid with no dips, graphics cranked. I'm looking forward to some of the newer souls-like games on the OLED eventually for the glorious black depths, 4k rez, and the fact that some of the newer ones are 120hz capable. It's too bad interpolation causes input lag. A 60fps game would really benefit from increased frames on a 120hz display.

Bloodborne has terrible frame pacing. If you have a PS4 Pro, turn on the boost feature in the settings, it helps. If there is ever a game that I would like remastered for PS5 or just released on PC, it's BB. Love that game despite its issues but that "sometimes 30 fps" experience is rough coming from PC games or even modern "stable 30 fps" PS4 games.

For me anything with a stable 60+ fps is good but I like having the headroom to go above that number. Everything on top of that is an improvement in how it feels to play.

Unfortunately Souls games and 120 Hz is not happening in anything but Sekiro on PC. That needs a mod tool but after that runs quite gloriously at 100-120 fps and I haven't noticed any issues, I played through it like that several times. I hope they support arbitrary framerates in their future games.
 
You are a rockstar kasakka! I really appreciate your prompt help! After updated my Club3D adapter to the latest, I am running 3840x1600@100hz as a test and it's working great on the 3080-- No GSYNC of course but buttery smooth compared to 60hz.

I haven't been able to test the 2080 Ti yet but I will. So odd that HDMI 2.1 to HDMI 2.1 won't work for custom resolutions over 60hz but DP 1.4 to HDMI 2.1 does work... but GSYNC doesn't? So odd.

EDIT:

Noticed that 3840x1600@120hz with Club3D adapter cuts off the edges of the screen:
View attachment 284405

Also gamma/brightness seems to be lower and mode is forced to RGB in NVCP...

I just tested and for me 3840x1600 120 Hz will drop out of HDR on the desktop but works fine without cuttng any edges or anything. In games I have been able to get it working with HDR too.
 
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Unfortunately most of the souls games are 60fps but at least I can lock 60fps minimum with everything cranked. I'd like to play Nioh2 and I know that is still unfortunately 60fps cap in the sequel.

I think remnant from the ashes is 120hz though it's not fully souls-like, also star wars jedi fallen order which while isn't hard core souls-like is very souls-ish gameplay.
The upcoming assassin's creed valhalla is supposed to put a much more challenging stamina meter souls-like gameplay style into the game which some people are already whining about lol.

I think mortal shell is 120hz capable which is very souls-like, though it could use more work on making richer environments, and like you said - Sekiro can be unlocked which is great. There is also a very promising looking game in development now which is based on an avatar of the monkey king. I've always been a fan of the monkey king mythology and movies. I don't know what the frame rate cap will be or if it can be unlocked since it is still in development but hopefully the new consoles with hdmi 2.1 will give some weight to higher frame rates for it and for ports and multi platform development in general.

 
I just tested and for me 3840x1600 120 Hz will drop out of HDR on the desktop but works fine without cuttng any edges or anything. In games I have been able to get it working with HDR too.

I really hope it works fully on hdmi 2.1 to hdmi 2.1 off of a 3000 series gpu eventually.
I understand that people find the club3d adapter info valuable for previous generations of gpus, especially since the 3000 series stock is so bad currently. It can be confusing having to keep filtering out or separating the club3d info from short replies, having to dig back through the quoted messages.

From what you guys have been saying it seems like custom ultrawide resolutions 1:1 (letterboxed with ultra black OLED bars) at "4k-ish" (3840 x 1600) 10bit 444 120hz VRR is not possible off of a 3000 series gpu currently so you have to resort to using the club3d adapter and it's limitations, the worst of which is no VRR/g-sync.
 
I really hope it works fully on hdmi 2.1 to hdmi 2.1 off of a 3000 series gpu eventually.
I understand that people find the club3d adapter info valuable for previous generations of gpus, especially since the 3000 series stock is so bad currently. It can be confusing having to keep filtering out or separating the club3d info from short replies, having to dig back through the quoted messages.

From what you guys have been saying it seems like custom ultrawide resolutions 1:1 (letterboxed with ultra black OLED bars) at "4k-ish" (3840 x 1600) 10bit 444 120hz VRR is not possible off of a 3000 series gpu currently so you have to resort to using the club3d adapter and it's limitations, the worst of which is no VRR/g-sync.

That's correct and it's not even custom resolutions that don't work straight from HDMI 2.1 on the 3xxx series cards, it's the custom refresh rates that seem to have the issue.

And you are correct, even though there is a lot to love about the CX 48, I am only interested in running at 3840x1600 on PC. There are too many remaining caveats for me at the moment even with the adapter where I got 3840x1600 @ 100hz working.
 
This is silly. So 120HZ ultrawide works on the adapter but not actual HDMI 2.1? Jeez. They need to update the adapter to do gsync then maybe I'll pick it up.
 
That's correct and it's not even custom resolutions that don't work straight from HDMI 2.1 on the 3xxx series cards, it's the custom refresh rates that seem to have the issue.

And you are correct, even though there is a lot to love about the CX 48, I am only interested in running at 3840x1600 on PC. There are too many remaining caveats for me at the moment even with the adapter where I got 3840x1600 @ 100hz working.

I'm not only interested in that but it would be a nice feature so I hope they implement that in firmware fixes in the long run. Not a total deal breaker for me personally but it would be good for some racing games with my wheel and for a few other games for the frame rate increase and game world increase. With such a large monitor it would be very useful as an option.


I posted a pic of the rig on page 105, Sept 21st. I don't want to take up more real estate on the board posting it again.

BTW, my left CX48 is not lagging any more. Somehow the mode got turned off "game". This setup is rocking for me now in 7680x1440. I can't wait to upgrade to an RTX 3090 to really get it going, and try triple 4k. My SLI Pascal Titan XP's can't perform well enough for me there.

When a hdmi monitor flashes it can lose sync. I think it's something to do with hdmi+hdcp (copy protection) handshaking. Anyway if you lose sync the monitor can go back to it's default since it is considering it as if it is seeing the source for the first time again. When I had to hot plug my one samsung hdmi TV's hdmi plug out of and back into it's displayport adapter occasionally due to blinking on wakeup from time to time, it would default back to hdmi named input instead of pc. I could tell immediately since it dropped RGB (which is 444). My text became tattered until I went back into my TV's osd and set it back to PC (which turns on RGB signal).

Lately I've switched one of my two samsung 60hz 4k VA tvs to the hdmi port instead of using two displayport adapters. I also started using blank screensavers on the TVs and a space star-field wormhole type one on my gaming monitor in the middle. I hit a hotkey on my streamdeck to minimize all windows and then another to start the screesaver. Then I'll turn the TV's off with their remote (one remote works for both since it's the same tv). Unfortunately I have to get up and walk over to my gaming monitor to turn it off. To be clear - I'm not putting my pc itself to sleep, just turning off the monitors. You could enable a lot of power saving on usb and hdd's, network devices, even fan profiles, etc if you had to conserve power more for some reason while still keeping the screensaver running and keeping the power option for turning off monitors set to "never".
When I return, I turn on the monitors first with the screensaver still running, then move my mouse to switch out of screensaver mode after the TVs are completely "booted up". Between that or the hdmi port on one of the TVs instead of two displayport adapters, I haven't had any blinking or no signal issues for the past few days. I have been away at work a lot the last few days however so I'll keep you posted.

I also want to let you know that I've learned that the gigabyte aorus 3090 line of gpus is going to have three hdmi 2.1 ports on them. I'm hoping that their aorus waterforce AiO cards will have 3x hdmi 2.1 ports too. I'm going to keep an eye on those as they become available since I'll be using three hdmi tvs even though it's not for the same usage scenario as yours. That way I wouldn't have to use any displayport adapters at all. Incidentally, gigabyte has a 3yr warranty on their gpus as well which is encouraging, but I don't know anything about how good their support system is. My last two gpu purchases were evga since 2014. That was dual gpu for sli both times but this time I'd rather just get a 3090, especially since NVIDIA is openly ditching SLI now and since DLSS performance increase is a thing. Now instead of looking for games that support SLI I'll have to look for games with DLSS support though. :rolleyes:
 
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I have a few more data points to add, hopefully this testing is useful for you all. I currently have a unicorn 3080 FE (newest drivers) paired with a 48" CX that I manually updated with USB from the Korean firmware link.

Good news and bad news. Good: resized resolutions do work! Bad: it's a work around for custom resolutions and only 8 bit applies, not 10 bit.

Instead of clicking "customize" for custom resolutions in Nvidia control panel (which didn't work for me, just goes to black screen), choose 3840x2160 at 120hz at 8 bit. Then click on "Adjust desktop size and position." Under Scaling tab choose "No scaling" and "Perform scaling on:" GPU. Then click on the Size tab and "Enable desktop resizing" and then "Resize." I manually moved the sliders to 3840x1620 (it wouldn't allow for less than 1620).

3840x1620 appears to work just fine at a combo of 120hz, HDR, Gsync, 4:4:4 chroma. However it won't work for me in 10 bit, it needs to be 8 bit. LG HDMI diagnostic menu reports 3840x2160p, 120hz, RGB, 8 bit.

2560x1440 at 120hz also only works for me at 8 bit. If I choose 10 bit, the diagnostic menu reports dropping down to 60hz. Using the resize trick, I can make 2560x1440 120hz 8 bit work as an ~32" window in the center with "no scaling." That's a great option for competitive FPS games.

There are clearly still many bugs in this firmware, but it's a huge step in the right direction. Perhaps CRU fiddling could fix much of this? I'm not an expert there. Hopefully LG engineers will continue their recent fast pace and issue more updates shortly.
 
I have a few more data points to add, hopefully this testing is useful for you all. I currently have a unicorn 3080 FE (newest drivers) paired with a 48" CX that I manually updated with USB from the Korean firmware link.

Good news and bad news. Good: resized resolutions do work! Bad: it's a work around for custom resolutions and only 8 bit applies, not 10 bit.

Instead of clicking "customize" for custom resolutions in Nvidia control panel (which didn't work for me, just goes to black screen), choose 3840x2160 at 120hz at 8 bit. Then click on "Adjust desktop size and position." Under Scaling tab choose "No scaling" and "Perform scaling on:" GPU. Then click on the Size tab and "Enable desktop resizing" and then "Resize." I manually moved the sliders to 3840x1620 (it wouldn't allow for less than 1620).

3840x1620 appears to work just fine at a combo of 120hz, HDR, Gsync, 4:4:4 chroma. However it won't work for me in 10 bit, it needs to be 8 bit. LG HDMI diagnostic menu reports 3840x2160p, 120hz, RGB, 8 bit.

2560x1440 at 120hz also only works for me at 8 bit. If I choose 10 bit, the diagnostic menu reports dropping down to 60hz. Using the resize trick, I can make 2560x1440 120hz 8 bit work as an ~32" window in the center with "no scaling." That's a great option for competitive FPS games.

There are clearly still many bugs in this firmware, but it's a huge step in the right direction. Perhaps CRU fiddling could fix much of this? I'm not an expert there. Hopefully LG engineers will continue their recent fast pace and issue more updates shortly.

Given that it doesn't work the "normal" way with GPU scaling, the problems are entirely in Nvidia drivers/NVCP, not the firmware. Literally what GPU scaling is is sending a "normal" 4k signal to the TV (which we know works at 4k 10bit RGB 120hz on 30 series cards). I think the deal is that there have been some really cludgey things done in Nvidia drivers and/or NVCP to support things specifically for LG OLEDS over HDMI 2.1 (as the only display currently available that supports signals of this bandwidth) that people are finding broken edge cases in. Hopefully Nvidia cleans them up for the people interested in custom resolutions.
 
No problem.
Another update on my particular setup that might be relevant to other displayport adapters on hdmi ports.

Framing in quotes for brevity:
I had a TCL S405 and a Samsung NU6900 both off of "regular" active hdmi 2.0b (4k UHD HDR 60hz capable) displayport adapters, along with a LG VA g-sync gaming monitor on displayport to displayport.

I never put my system itself to sleep but I would use power saving on the screens themselves so that they would go into standby after awhile. Sometimes when I would wake up the screens from standby, one or the other would blink repeatedly before initializing to a solid signal. Rarely, they would end up showing "no signal" at all after the blinking period. Also rarely, when waking up from standby one or the other would have "no signal" right off the bat without the blinking. If I was stuck in a blinking loop or had no signal, I would hot unplug and re-connect the hdmi cable from the end of the displayport adapter of the TV with the problematic signal and it would then initialize properly. I'm assuming this is a hdmi(+hdcp?) handshake issue of some kind due to the adapter.

Eventually, my TCL's backlight died on one side after around 1.5 yrs I guess, so recently I replaced it, adding a second samsung NU6900 to the array. Last week I swapped the "old" samsung's hdmi cable to connect directly to the hdmi port on the gpu (1080ti for now). Today my displayport adapter connected samsung was blinking on wakeup but the hdmi to hdmi one was solid. The displayport one blinked 12 - 15 times and then ended up solid. After these issues resolve one way or another, there is never any other problem with the displays during a session - until the screens go into standby again where it becomes another roll of the dice. It was always one display or the other, never both, when both were on displayport adapters. So far I've not seen the hdmi to hdmi connected samsung blink and I don't believe it should as I'm pretty sure it's hdmi being finicky about handshaking/initialization.

I'm not ignoring the fact that this issue may have contributed to the lower lifespan of the TCL S405's backlight on what was likely a slightly cheaper build/screen. I've heard that the gigabyte aorus 3090 cards will have three hdmi 2.1 ports on them so I'm looking at those as my target card, even though they will prob have a premium price.

I'll keep updating on the state of the signals and as I eventually should be able to upgrade to a 3x hdmi aorus card and a LG 48 CX in the following months. Hopefully in november for the OLED and whenever I can find stock on the 3x hdmi aorus card at retail price.
 
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No problem.
Another update on my particular setup that might be relevant to other displayport adapters on hdmi ports.

Framing in quotes for brevity:


I'm not ignoring the fact that this issue may have contributed to the lower lifespan of the TCL S405's backlight on what was likely a slightly cheaper build/screen. I've heard that the gigabyte aorus 3090 cards will have three hdmi 2.1 ports on them so I'm looking at those as my target card, even though they will prob have a premium price.

I'll keep updating on the state of the signals and as I eventually should be able to upgrade to a 3x hdmi aorus card and a LG 48 CX in the following months (hopefully in november).

Ok, all good to know!

I am still having trouble when waking my TV's from sleep since I switched to 7860x1440 spanned for SLI. Before with all set at 1440p individually, I could turn on the TVs first, and then wake my PC and I was able to maintain my desktop resolution. But now when waking in an SLI span using the same procedure, I am suddenly in a low spanned res (I forget what).

I then have to open the NCP, set it to spanned 4k, and then have to add back in 7860x1440 in the resolution options, then enable it. Such a pain in the butt. But as you say, I am hesitant to not let these TVs power down. I would rather go through this hassle then burn them out by preventing their power down.

Great news about the 3090 and 3 HDMI ports. I think this will alleviate the issues I am having. But I also need to update my Club 3D adapters. Maybe that will do something.

EDIT: I just updated the firmware on the three CX's also. Will see if that makes any difference!
 
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Okay.. so I'm about to pull the plug for a 55" LG CX for 1200 EUR.

Can someone please talk me out of it? (Coming from a 43" Philips HDR1000 VA Monitor)
 
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