Custom Resolution Utility (CRU)

[gus84HFR]

First of all, thank you for the awesome piece of software !

I'm using it to do something a little bit special:
Because it was almost impossible to find a big LCD screen in 4:3 (or 5:4) ratio for my arcade cab, I've decided to put a 4K TV monitor in it (verticaly), and to use only the center with a custom resolution !

To be clear, I've done it like this:

And of course, the black part are not visibles, they are behind the control panel and the marquee.

Here is my setup in CRU:


I'm using a windows 11 PC, with a RTX 3060 and everything works fine.
I use retroarch to emulate most of my arcade game, and when you set it up at the rigth resolution and add a few scanline, the result is incredible, this is almost a CRT screen !


But now the problem: for the SEGA Model 2 games, I use the M2emulator program.
And everytime I switch the games to full screen, my TV goes black and go "no signal"

I've setup the emulator to use my custom resolution of 2160x1728 when in full screen, but there must be a problem with the refresh rate or something.

(I know the game is running fine, because if I look with my main computer via VNC I can see the game running in full screen)

Have you got any idea of what I'm doing wrong ?

[Mystery D]

(09-02-2025 01:29 PM)ToastyX Wrote:  

(08-31-2025 04:52 PM)Mystery D Wrote:  Hello! I have a 1440p 144hz freesync display (Acer EI272UR), with an EVGA RTX 3080 ftw3.

I'm trying to use CRU to allow EITHER freesync or gsync to work - WITHOUT FLICKER. Ive disabled the freesync range in the extension block and freed 50 bytes. I then changed the VRR range by editing the active monitor (topmost edit button) to 47-144, since the default 48-144 is reported as 49-144 by windows 11.

I am unsure if I need to edit the detailed resolution, and/or the CTA-861 detailed resolution to something that will work with less flickering when the framerate is below a certain figure.

I have G-SYNC and G-SYNC compatible enabled via nvidia app, though this monitor is not validated as gsync compatible. With g-sync compatible un-checked, no type of VRR seems to work at all.

Anyone have advice on if there is something I can do to maximize my VRR experience on this Freesync monitor with my Nvidia GPU?

Thanks in advance

FreeSync/G-SYNC should not flicker. That's a monitor design limitation. The only thing you can do is reduce the VRR range or disable VRR.

Perhaps flicker wasn't the correct term, or I should have been more detailed. By flicker I mean the image never disappears. It just seems to shift rapidly in brightness but only when the frame rate drops below the bottom limit of the VRR range. For example, during loading screens that have a 30fps cap, or if you're otherwise seeing a low framerate output. Regular gameplay seems fine, long as the frame rate is above 48ish fps.

I guess my real question is what should I be doing to ensure I'm getting the best experience? I have already disabled Freesync in the extension block.

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(09-04-2025 04:36 PM)Case Wrote:  

(08-31-2025 04:52 PM)Mystery D Wrote:  Hello! I have a 1440p 144hz freesync display (Acer EI272UR), with an EVGA RTX 3080 ftw3.

I'm trying to use CRU to allow EITHER freesync or gsync to work - WITHOUT FLICKER. Ive disabled the freesync range in the extension block and freed 50 bytes. I then changed the VRR range by editing the active monitor (topmost edit button) to 47-144, since the default 48-144 is reported as 49-144 by windows 11.

I am unsure if I need to edit the detailed resolution, and/or the CTA-861 detailed resolution to something that will work with less flickering when the framerate is below a certain figure.

I have G-SYNC and G-SYNC compatible enabled via nvidia app, though this monitor is not validated as gsync compatible. With g-sync compatible un-checked, no type of VRR seems to work at all.

Anyone have advice on if there is something I can do to maximize my VRR experience on this Freesync monitor with my Nvidia GPU?

Thanks in advance

I assume you're referring to the so-called "VRR flicker". If you are, then your only real option to lower that is to raise the lower end of the VRR range. I'd try around 65 Hz or so (so that around 60, you're still in LFC range and get double refresh rate). You don't have a lot of leeway, though, since your monitor can only do 144 Hz.

Thanks for the reply. I am uncertain what LFC range means, I will have to do some research. I'm going to try increasing the lower end of the VRR range. I'm assuming that's done by editing the profile, not the Freesync range in the extension block? I deleted that a while back, I heard gsync looks at one value and freesync looks for the extension block?

[ToastyX]

(09-04-2025 11:27 PM)Mystery D Wrote:  Perhaps flicker wasn't the correct term, or I should have been more detailed. By flicker I mean the image never disappears. It just seems to shift rapidly in brightness but only when the frame rate drops below the bottom limit of the VRR range. For example, during loading screens that have a 30fps cap, or if you're otherwise seeing a low framerate output. Regular gameplay seems fine, long as the frame rate is above 48ish fps.

I guess my real question is what should I be doing to ensure I'm getting the best experience? I have already disabled Freesync in the extension block.

I'm aware of what you mean. That's a monitor limitation and not an inherent limitation of VRR. The real answer is to get a monitor that doesn't have that problem. This is why NVIDIA has G-SYNC certification because some monitors just have poor VRR implementations.

All you can do with your current monitor is either reduce the VRR range to try to reduce the flicker, or disable VRR if the flicker is causing too much trouble. When I say reduce the VRR range, I mean either increasing the minimum refresh rate or switching to a lower refresh rate to reduce the maximum. NVIDIA ignores the FreeSync data block so that makes no difference.

LFC is low frame rate compensation, which basically repeats frames at lower frame rates so the refresh rate is within the range, so 30 FPS becomes 60 Hz. If you raise the minimum to 65 Hz, 30 FPS will become 90 Hz. The maximum refresh rate needs to be at least twice the minimum refresh rate for LFC to cover all refresh rates below the minimum.

Normally you don't need to reduce the maximum. You can just switch to a lower refresh rate. The current refresh rate automatically becomes the maximum if it's within range, so if the VRR range is 48-144 Hz and you switch to 100 Hz, the range becomes 48-100 Hz.

[ToastyX]

(09-04-2025 08:30 PM)gus84HFR Wrote:  But now the problem: for the SEGA Model 2 games, I use the M2emulator program.
And everytime I switch the games to full screen, my TV goes black and go "no signal"

I've setup the emulator to use my custom resolution of 2160x1728 when in full screen, but there must be a problem with the refresh rate or something.

(I know the game is running fine, because if I look with my main computer via VNC I can see the game running in full screen)

Have you got any idea of what I'm doing wrong ?

I don't see how the same resolution can act differently in different programs unless your TV can't handle 1728x2160 @ 60 Hz and Retroarch is GPU scaling to another resolution, or maybe it's an issue with the TV not being able to handle VRR at 1728x2160.

[ToastyX]

(09-04-2025 08:30 AM)plamenmilev@gmail.com Wrote:  I have Asus MS27UC 4k monitor and Intel Integrated Graphics 750 (11th Intel gen).

Unfortunately, my hdmi out is only version 1.4.

However, I am trying to make it work with 1440p (2560 x 1440) resolution. I have added this as a detailed resolution in CRU (I chose AutomaticHDTV).

After restarting, as kindly explained here, this resolution doesn't show up in "List all modes".

Try importing the hdmi-audio.dat file.

[plamenmilev@gmail.com]

(09-05-2025 02:10 AM)ToastyX Wrote:  

(09-04-2025 08:30 AM)plamenmilev@gmail.com Wrote:  I have Asus MS27UC 4k monitor and Intel Integrated Graphics 750 (11th Intel gen).

Unfortunately, my hdmi out is only version 1.4.

However, I am trying to make it work with 1440p (2560 x 1440) resolution. I have added this as a detailed resolution in CRU (I chose AutomaticHDTV).

After restarting, as kindly explained here, this resolution doesn't show up in "List all modes".

Try importing the hdmi-audio.dat file.

Thanks for the reply!

I have imported the file.

Unfortunately, it still doesn't work.

Here are my current settings:






Is there something else I could try?

Best,
Plamen

[ToastyX]

(09-05-2025 08:03 AM)plamenmilev@gmail.com Wrote:  Thanks for the reply!

I have imported the file.

Unfortunately, it still doesn't work.

That should work. Do you have Intel's graphics driver installed?

[plamenmilev@gmail.com]

(09-05-2025 01:34 PM)ToastyX Wrote:  

(09-05-2025 08:03 AM)plamenmilev@gmail.com Wrote:  Thanks for the reply!

I have imported the file.

Unfortunately, it still doesn't work.

That should work. Do you have Intel's graphics driver installed?

Yes, latest version 32.0.101.7026.