Custom Resolution Utility (CRU)

[letsbleed]

Hello,

Is it possible to enable VRR on the TCL c845? I've tried adding freesync range into the extension block but didnt work. Also I've tried to set the range in the Variable refresh rate option for the hdmi 2.1 support entry (defaults is blank) but that gives me a black screen and everything breaks. If you guys have any tips how to make this work please tell me!!! There are some prints bellow for the settings!!

[ToastyX]

(04-13-2025 03:13 AM)letsbleed Wrote:  Is it possible to enable VRR on the TCL c845? I've tried adding freesync range into the extension block but didnt work. Also I've tried to set the range in the Variable refresh rate option for the hdmi 2.1 support entry (defaults is blank) but that gives me a black screen and everything breaks. If you guys have any tips how to make this work please tell me!!!

You shouldn't be using CRU like this. If the TV supports VRR, it should already be defined. You might need to enable VRR in the TV's settings. It should be explained in the TV's manual somewhere. I think for TCL TVs, you need to have Game Master on.

[LGBoy]

(04-12-2025 06:16 PM)ToastyX Wrote:  

(04-12-2025 05:58 PM)LGBoy Wrote:  

Quote:You need to adjust the scaling in the TV's settings to "just scan" instead of upscaling.

Just scan is greyed out but set to On, in TV's settings.

I plan to upgrade soon to Win 11 and I will try this again once I do. Maybe I will have more luck there. Thank you.

Windows 11 wouldn't make a difference. The native resolution is always sent to the TV, so the TV is the one doing the upscaling. You need to find a way to make the TV not upscale. The "just scan" option should not upscale, and if it's not available, then some other setting is causing it to be disabled.

The custom resolution you created in the NVIDIA control panel must have been a GPU-scaled resolution because if it were sent to the TV, the behavior would be the same as with CRU. When you create a custom resolution in the NVIDIA control panel, the active resolution is the resolution sent to the TV, not the display mode at the top, so if those are different, you end up with a GPU-scaled resolution.

I admit I don't have any idea where would I find such an option. Googled a bit but nothing relevant came up. I did a clean reinstall of several drivers and every time the result was the same.

But I found kind of a workaround. In CRU, under Extension blocks/CTA-861 I created a detailed 3824x2151 resolution. That way, in NV control panel, it is considered as regular monitor resolution, not a custom one. I turned on DLDSR and while it uses a 3840x2160 as a baseline, I get to keep 3824x2151 for desktop and most of the games.

[ildottore101]

(04-12-2025 09:25 PM)ToastyX Wrote:  

(04-12-2025 09:07 PM)ildottore101 Wrote:  Ok, i edited displayid 1.3 and got blackscreen again. On cta-861 i cant enable it becaus pixelclock turns red.

That is supposed to work if the monitor supports the timing. Do you have any other monitors connected?

No other Monitors connected.

I was able to use these settings in nvidia driver custom resolution successfully but only without DSR.
With DSR on, the customres setting in nvidia driver is greyed out/disabled.