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***ToastyX*** · 12-02-2020, 10:36 PM

(12-02-2020 08:14 PM)easterhands Wrote: I can create the resolution in nvidia control panel and it works, just HDR doesn't come on which is why I want to use CRU. So I assume I'm not doing something right.

What timing parameters are you using with the NVIDIA control panel?

***ToastyX*** · 12-02-2020, 10:36 PM

(12-02-2020 06:24 PM)traderdude123 Wrote: I also tried to edit and add 4k 100 hz in the detailed resolution , but its not allowing me to go over 60 hz. It shows numbers in red color if i go above 60 hz.

You have to add it as a TV resolution or in a DisplayID extension block.

easterhands · 12-02-2020, 11:37 PM

(12-02-2020 10:36 PM)ToastyX Wrote:
(12-02-2020 08:14 PM)easterhands Wrote: I can create the resolution in nvidia control panel and it works, just HDR doesn't come on which is why I want to use CRU. So I assume I'm not doing something right.
What timing parameters are you using with the NVIDIA control panel?

So I left everything is automatic and it seems like it's leaving the active pixels the full resolution and just changing the windows display resolution.

https://cdn.discordapp.com/attachments/5...nknown.png

I see in CRU I have to change the active pixels it seems? No alternate timing presets where it changed the active resolution worked on my display.

***ToastyX*** · 12-03-2020, 01:38 AM

(12-02-2020 11:37 PM)easterhands Wrote: So I left everything is automatic and it seems like it's leaving the active pixels the full resolution and just changing the windows display resolution.

https://cdn.discordapp.com/attachments/5...nknown.png

I see in CRU I have to change the active pixels it seems? No alternate timing presets where it changed the active resolution worked on my display.

That's a GPU-scaled resolution. CRU can't create scaled resolutions directly, but you can enable GPU scaling in the NVIDIA control panel by going to "Adjust desktop size and position" and setting "Perform scaling on:" to GPU. Then lower resolutions will be scaled to the native resolution by the GPU instead of sending it to the TV. In this case, both "Aspect ratio" and "No scaling" will center the resolution with black bars since the width isn't being changed.

traderdude123 · (Last edited: 12-03-2020, 07:28 AM by traderdude123)

(12-02-2020 10:36 PM)ToastyX Wrote:
(12-02-2020 06:24 PM)traderdude123 Wrote: I also tried to edit and add 4k 100 hz in the detailed resolution , but its not allowing me to go over 60 hz. It shows numbers in red color if i go above 60 hz.
You have to add it as a TV resolution or in a DisplayID extension block.

4k/100hz is available in TV resolution.

I tried adding in the DisplayID extension block and when i restart, signal goes off.

Had to reset all.

Another update:

When i select YCC442 in the nvcp , i get 4k/100hz/12bpc.

is there some restriction in the bandwdith per channel in the HDMI 2.1?if that is indeed the case, then i think its not possible to get YCC444/4k/100hz/12 bpc.

what you think?

***ToastyX*** · 12-03-2020, 01:59 PM

(12-03-2020 07:25 AM)traderdude123 Wrote: is there some restriction in the bandwdith per channel in the HDMI 2.1?if that is indeed the case, then i think its not possible to get YCC444/4k/100hz/12 bpc.

HDMI 2.1 has enough bandwidth. It might be a GPU or driver limitation.

traderdude123 · 12-03-2020, 04:52 PM

(12-03-2020 01:59 PM)ToastyX Wrote:
(12-03-2020 07:25 AM)traderdude123 Wrote: is there some restriction in the bandwdith per channel in the HDMI 2.1?if that is indeed the case, then i think its not possible to get YCC444/4k/100hz/12 bpc.
HDMI 2.1 has enough bandwidth. It might be a GPU or driver limitation.

Then would CRU util might help?

I really hate that LG decide to cut the bandwidth.

Now this is the only hope to get a high refresh rate with full chroma.

Please Toasty, do see if something can be done.

Thanks for all your effort.

AchillesBoi · 12-03-2020, 07:58 PM

(12-01-2020 04:22 AM)ToastyX Wrote:
(11-30-2020 09:32 PM)AchillesBoi Wrote: It seems to me that the bug here is caused by editing the EDID, maybe something CRU is doing is conflicting with the way Windows (or the GPU) reads that data?
No, it's an AMD driver bug. It's probably applying an 8-bit gamma table to 10-bit color, causing 1/4th the brightness.

Like I said earlier, this bug is also present when using 8 bit color. If I set my display to 8 bit color before applying the CRU modifications, and then I make sure it is set to 8 bit color after using CRU the bug still shows up, so I am sure it is not doing what you think it is doing.

Oh well, I was hoping for a fix but I understand if it is outside your abilities. Thank you anyways, I really appreciate it!

***ToastyX*** · 12-04-2020, 01:14 AM

(12-03-2020 07:58 PM)AchillesBoi Wrote: Like I said earlier, this bug is also present when using 8 bit color. If I set my display to 8 bit color before applying the CRU modifications, and then I make sure it is set to 8 bit color after using CRU the bug still shows up, so I am sure it is not doing what you think it is doing.

Oh well, I was hoping for a fix but I understand if it is outside your abilities. Thank you anyways, I really appreciate it!

I don't know what conditions trigger the bug because not everyone has this problem. It has to be related to incorrectly setting the gamma table somehow because I doubt it's changing the brightness of the monitor. You can try using the Windows display calibrator and just click next all the way to create a color profile with the default colors. Then maybe Windows will load the correct colors and override whatever the driver is doing.

***ToastyX*** · 12-04-2020, 01:26 AM

(12-03-2020 04:52 PM)traderdude123 Wrote: Now this is the only hope to get a high refresh rate with full chroma.

YCbCr/RGB 4:4:4 is full chroma. The bit depth is color precision. I think the TV has a 10-bpc panel, so it can't really display 12 bpc anyway.