Custom Resolution Utility (CRU)

[ToastyX]

(11-04-2023 07:54 PM)KukoCL Wrote:  I've been reading in these forums and reddit about solving screen brightness flickering because of VRR, so all i want to do is to change the Variable Refresh Rate range but i can't figure out how to do it.

I have an Odyssey G9 OLED that i'm always using at 5120x1440 at 240hz.

I thought all i had to do is press the "edit" button and change the V value but the values are empty, or they have lower hertz values than my current refresh rate in use, and my monitor is also displayed many times in the dropdown menu.

Are you using DisplayPort or HDMI? What GPU?

[ToastyX]

(11-04-2023 09:12 AM)opa99 Wrote:  I have tried different settings on the tv, and on the extension blocks. What I currently have and what gets me "closest" to the end is attached as the CRU settings, and the windows settings. This leads Windows seeing the channels, and trying to output sound (animation is there), but AVR only receives 2.0 audio.

Does this happen at 3840x2160 or only the custom resolutions?

[opa99]

(11-05-2023 09:42 PM)ToastyX Wrote:  

(11-04-2023 09:12 AM)opa99 Wrote:  I have tried different settings on the tv, and on the extension blocks. What I currently have and what gets me "closest" to the end is attached as the CRU settings, and the windows settings. This leads Windows seeing the channels, and trying to output sound (animation is there), but AVR only receives 2.0 audio.

Does this happen at 3840x2160 or only the custom resolutions?

Happens on all three resolutions I have tried, including the 3840x2160.
Currently the resolution I am using is 3840x1500, 120hz, HDR.

This issue has brought me to the point where I am considering if my AVR bought in 2015 (while being a rather capable at that time) should be upgraded. Therefore I do not know if all of these issues could be resolved by replacing the AVR with one that can do eARC. I have not yet discovered how to tell what signal is actually sent with these EDID changes to TV (Windows looks as if it could be sending LPCM 5.1, but the TV refuses to send it to AVR)...

[N8TM8T]

Hi ToastyX, thank you so much for continuing to support this tool and answer questions. You helped me once before a few years back and I'm hoping you could help me again.

I recently upgraded to a 7900XTX to run my 144Hz 4k display, and in an attempt to lower the idle power draw, I increased the Extension Block's Vertical Blanking to the point where it allowed my GPU's VRAM to downclock, solving my power draw issue.
Unfortunately, ever since I did that a few days ago, I have noticed that the display will very occasionally flicker with what seems to be a white screen (or at least a different color that is noticeable). Its not consistent, maybe only once every few minutes depending on what im doing and it seems to only happen for like a frame or so, so I've been unable to capture it. The only consistent pattern is that it generally seems to happen when there is GPU activity, like when im scrolling through a page in Chrome with Hardware Acceleration enabled, or when I close a window. It even happened once or twice while I was typing this post. It doesnt happen every time, but those are the times I have noticed it.

I was wondering if you might be able to suggest any reasons for this to be happening or changes to my timings that might resolve this. According to the data-sheet for my monitor's panel that I found online, I SHOULD still be well within the monitor's specifications and I am confused at why this behavior might be occurring.

My setup:
7900XTX
3 Displays:

• 2x 1080P 60Hz Viewsonic Displays (model number VX2452MH) (one connected via HDMI, the other connected via a Club3D CAC-1082 cable)
  

• 1x UHD 144Hz ASUS ROG display (model number XG27U) (connected via DP 1.4)
  

Here are stock timings for my 4k Display:
   

Here are my modified timings for my 4k Display with increase vertical blanking:
   

Here are my 1080p Display's timings (in case its relevant):
   

And here is the timing data sheet for my 4k panel:
   

Thank you again for all the help! Your amazing!

[KukoCL]

(11-05-2023 11:57 AM)MoonDoggy Wrote:  

(11-04-2023 07:54 PM)KukoCL Wrote:  Hello!,

I've been reading in these forums and reddit about solving screen brightness flickering because of VRR, so all i want to do is to change the Variable Refresh Rate range but i can't figure out how to do it.

I have an Odyssey G9 OLED that i'm always using at 5120x1440 at 240hz.

I thought all i had to do is press the "edit" button and change the V value but the values are empty, or they have lower hertz values than my current refresh rate in use, and my monitor is also displayed many times in the dropdown menu.

So basically, if i press Edit on my active monitor i don't know what to write down in the V-rate, H-rate and Max pixel clock values because they're empty and i don't know how to know the proper values for those. I wanted to try something like 120-240hz as my VRR range.

I attached pictures of the "6 odyssey monitors" that i have there and their properties.

Thank you so much in advance to anybody who could help me!

I have a g9 too and what fixed the flicker for me was replacing the DP cable. I came to the conclusion that the provided DP cable from Samsung was faulty after watching a LTT video where they hooked various cables to a test to verify performance and the only cable to fail were Samsung oem cables. So I took a bet and got a Monoprice 8k DP 2.0 cable and my flicker issues went away. Another thing to mention, if you're getting black screen flashes in game (especially valve's source engine games) its because for some reason the frame rate is dropping to low for the VRR to function properly. in those games I just set the "Monitor Technology" setting to fixed refresh in nvidia 3d setting for that application and problem solved.

heres the cable i got if you want to check it out
https://www.monoprice.com/product?p_id=42992

Woah, i didn't even think that it could be the cable because it was "original" from Samsung.

I always watch LTT but i didn't see that video.

I know it's a little off topic, but do you have an nvidia card with updated drivers connected to that G9?, i'm having terrible random flicker with artifacts once in a while but only happens when i'm idling, like reading on my browser or using Telegram.

[wyup]

Hi, thanks for this amazing utility and support.

I want to sync laptop screen and external projector with the same exact vertical refresh frequency rate so in duplicated/clone screen mode I get the best results for video playback and minimum drift from standard 60 Hz refreshing rate. I have noticed in the past that running cloned screens with slightly different default refreshing rates makes the actual refreshing rate of external screen to be in between both, instead of exact native.

By default my laptop screen specifies 60.307 Hz refresh rate and my external DLP projector 60 Hz. If I run external only, playback stats report exact 60.000 Hz, but when I run in dual clone mode it gets like 60.100 or so.

I have copied external monitor parameters to laptop screen and it works, but I get a jagged line in playback stats, and sometimes not exact 60.000 Hz. I'd like to get straight a/v lines as normal.

Am I doing right? What do you advise? Maybe replace laptop monitor params with Automatic PC and 60.00 Hz? Or equalling black porch/blanking between screens?
I'd like to run clone mode and 60.000 Hz on both, so playback is as stable as possible with minimum repeated frames and judder.

One laptop has 1600x900 screen and another laptop has 1920x1080. Both are connected to the same 1920x1080 DLP projector.

[ToastyX]

(11-07-2023 02:58 PM)wyup Wrote:  I want to sync laptop screen and external projector with the same exact vertical refresh frequency rate so in duplicated/clone screen mode I get the best results for video playback and minimum drift from standard 60 Hz refreshing rate. I have noticed in the past that running cloned screens with slightly different default refreshing rates makes the actual refreshing rate of external screen to be in between both, instead of exact native.

By default my laptop screen specifies 60.307 Hz refresh rate and my external DLP projector 60 Hz. If I run external only, playback stats report exact 60.000 Hz, but when I run in dual clone mode it gets like 60.100 or so.

I have copied external monitor parameters to laptop screen and it works, but I get a jagged line in playback stats, and sometimes not exact 60.000 Hz. I'd like to get straight a/v lines as normal.

Am I doing right? What do you advise? Maybe replace laptop monitor params with Automatic PC and 60.00 Hz? Or equalling black porch/blanking between screens?
I'd like to run clone mode and 60.000 Hz on both, so playback is as stable as possible with minimum repeated frames and judder.

One laptop has 1600x900 screen and another laptop has 1920x1080. Both are connected to the same 1920x1080 DLP projector.

CRU has an "Exact" timing option that can make the refresh rates match perfectly, and "Automatic PC/HDTV" also happen to be exact at 1920x1080 @ 60 Hz and 1600x900 @ 60 Hz, but there's still no guarantee that the displays will be synchronized because the refreshes could start at different times and stay offset from each other, and the hardware clock might not match perfectly at different pixel clocks even if the refresh rate is mathematically the same. You'll have to try it and see what happens.

[ToastyX]

(11-07-2023 02:36 AM)N8TM8T Wrote:  I recently upgraded to a 7900XTX to run my 144Hz 4k display, and in an attempt to lower the idle power draw, I increased the Extension Block's Vertical Blanking to the point where it allowed my GPU's VRAM to downclock, solving my power draw issue.
Unfortunately, ever since I did that a few days ago, I have noticed that the display will very occasionally flicker with what seems to be a white screen (or at least a different color that is noticeable). Its not consistent, maybe only once every few minutes depending on what im doing and it seems to only happen for like a frame or so, so I've been unable to capture it. The only consistent pattern is that it generally seems to happen when there is GPU activity, like when im scrolling through a page in Chrome with Hardware Acceleration enabled, or when I close a window. It even happened once or twice while I was typing this post. It doesnt happen every time, but those are the times I have noticed it.

I was wondering if you might be able to suggest any reasons for this to be happening or changes to my timings that might resolve this. According to the data-sheet for my monitor's panel that I found online, I SHOULD still be well within the monitor's specifications and I am confused at why this behavior might be occurring.

My setup:
7900XTX
3 Displays:

• 2x 1080P 60Hz Viewsonic Displays (model number VX2452MH) (one connected via HDMI, the other connected via a Club3D CAC-1082 cable)
  

• 1x UHD 144Hz ASUS ROG display (model number XG27U) (connected via DP 1.4)
  

Unless something changed with newer GPUs, normally it's not possible to change the memory clock if you have multiple displays with different resolutions or refresh rates because the displays won't be synchronized, although in theory this could work if the displays support variable refresh rate. The memory clock must change while all of the monitors are in the vertical blanking period between refreshes to be able to retrain the memory without seeing artifacts. You might be seeing an artifact of the memory clock changing when it's not supposed to, which would be a bug on AMD's end, or maybe changing the timing parameters affected variable refresh rate support in the monitor in some way, although I don't know if that affects the desktop. Try increasing the front porch instead of the back porch, and try increasing the lower end of the variable refresh rate range.

[ToastyX]

(11-06-2023 02:53 PM)opa99 Wrote:  Happens on all three resolutions I have tried, including the 3840x2160.
Currently the resolution I am using is 3840x1500, 120hz, HDR.

This issue has brought me to the point where I am considering if my AVR bought in 2015 (while being a rather capable at that time) should be upgraded. Therefore I do not know if all of these issues could be resolved by replacing the AVR with one that can do eARC. I have not yet discovered how to tell what signal is actually sent with these EDID changes to TV (Windows looks as if it could be sending LPCM 5.1, but the TV refuses to send it to AVR)...

You said the setup works with any other source than the PC, so ARC should be sufficient unless the TV is doing something different when passing audio from the PC to the AVR. What happens if you set the channels to 8 instead of 6? For the lower resolutions, there needs to be enough horizontal blanking to transmit the audio format. The default 3840x2160 should have enough.

[KukoCL]

(11-05-2023 09:42 PM)ToastyX Wrote:  

(11-04-2023 07:54 PM)KukoCL Wrote:  I've been reading in these forums and reddit about solving screen brightness flickering because of VRR, so all i want to do is to change the Variable Refresh Rate range but i can't figure out how to do it.

I have an Odyssey G9 OLED that i'm always using at 5120x1440 at 240hz.

I thought all i had to do is press the "edit" button and change the V value but the values are empty, or they have lower hertz values than my current refresh rate in use, and my monitor is also displayed many times in the dropdown menu.

Are you using DisplayPort or HDMI? What GPU?

Sorry i just read your answer.

It's displayport 1.4 and an RTX 4080.

Maybe i'm wrong but i think the problem is that CRU doesn't support 5120 pixels width (the width of my screen) so it shows blank values.

Thank you for your software and all your help you give here