Custom Resolution Utility (CRU)

[UnclWish]

I have Odyssey G5 G55T QHD, 144 Гц [LC27G54TQWIXCI] 2560x1440 monitor connected via DP 1.4 cable. Monitor support DP 1.2.
Matrix is 8 bit, but it can 10 bit - 8+FRC. 10 bit available only in 120Hz with resolution from EDID (Pixel clock must be less 575MHz to 10 bit work).

Problem with FreeSync enabled on 10 bit. It start to band colors. Changing to 8 bit - normal. Or disabing FreeSync on 10 bit - normal too. But 10 bit+FreeSync - color banding.
Looks like FreeSync disables FRC. Can it be so?

I tried different modes - 120Hz, 75Hz, 60Hz. Tried to change timins via CRU to CVT-RB and some other variants. But it not helps.

Please, can someone say me - it's a monitor feature? Or it's a bug? Can I fix it somehow?

[tombom]

hi
i am on a Samsung S95F (DSC forced) and a 4070ti Super. I was trying to delete all 4096 resolutions as they are giving me all kinds of headaches in games that refuse to default to 3840.

sure enough my edits were ignored by the driver as the opening post explains.

now apparently i am too daft to understand the workaround proposed in OP, so my question is: is it even possible to somehow get rid of the 4096 resolutions on a DSC forced display with 40x nvidia? and maybe sb could run me through it prettyplease?

much appreciated

[ToastyX]

(11-14-2025 07:19 PM)tombom Wrote:  now apparently i am too daft to understand the workaround proposed in OP, so my question is: is it even possible to somehow get rid of the 4096 resolutions on a DSC forced display with 40x nvidia? and maybe sb could run me through it prettyplease?

The registry workaround should let you remove 4096x2160 with CRU, but the pixel clock will be limited to the single-head limit, which is 1350 MHz for your GPU, so you'll be limited to 120 Hz by default, although you might be able to squeeze in 144 Hz with a custom detailed resolution if the TV will accept that. Just run RegEdit and navigate to the NVIDIA driver key (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\####), and add a new DWORD value named EnableTiledDisplay with the value 0. Then reboot (or restart the graphics driver), and CRU should work after that.

[ToastyX]

(11-14-2025 08:46 AM)UnclWish Wrote:  I have Odyssey G5 G55T QHD, 144 Гц [LC27G54TQWIXCI] 2560x1440 monitor connected via DP 1.4 cable. Monitor support DP 1.2.
Matrix is 8 bit, but it can 10 bit - 8+FRC. 10 bit available only in 120Hz with resolution from EDID (Pixel clock must be less 575MHz to 10 bit work).

Problem with FreeSync enabled on 10 bit. It start to band colors. Changing to 8 bit - normal. Or disabing FreeSync on 10 bit - normal too. But 10 bit+FreeSync - color banding.
Looks like FreeSync disables FRC. Can it be so?

I tried different modes - 120Hz, 75Hz, 60Hz. Tried to change timins via CRU to CVT-RB and some other variants. But it not helps.

Please, can someone say me - it's a monitor feature? Or it's a bug? Can I fix it somehow?

That sounds like a firmware bug or limitation. The monitor is not handling 10 bpc correctly with FreeSync enabled. I don't see how you can fix that unless there is some setting in the monitor that's causing the problem. You should ask Samsung support about that.

[UnclWish]

(11-15-2025 07:44 PM)ToastyX Wrote:  That sounds like a firmware bug or limitation. The monitor is not handling 10 bpc correctly with FreeSync enabled. I don't see how you can fix that unless there is some setting in the monitor that's causing the problem. You should ask Samsung support about that.

When FreeSync enabled there is almost no settings in monitor menu available. Only brightness, contrast, sharpness and colors - only r/g/b settings.
So, I think it's a technical issue or firmware bug or limitation as you said.
Already no warranty (((. So I can't give them monitor for no cost to fix...
It's sad that no fix for that. Will try to write to Samsung support.
Thnk you for answer!

P.S. Can it be due to FreeSync range is 48-144? Maybe if I set 120Hz FreeSync try to work in 144 on desktop? And disables FRC cause DP is 1.2 on monitor? Maybe changing FS range via CRU to 48-120 can help?

[ToastyX]

(Yesterday 05:57 AM)UnclWish Wrote:  P.S. Can it be due to FreeSync range is 48-144? Maybe if I set 120Hz FreeSync try to work in 144 on desktop? And disables FRC cause DP is 1.2 on monitor? Maybe changing FS range via CRU to 48-120 can help?

None of that should matter. You don't need to change the range. Just use 120 Hz and that automatically becomes the max.

[UnclWish]

(Yesterday 11:41 PM)ToastyX Wrote:  None of that should matter. You don't need to change the range. Just use 120 Hz and that automatically becomes the max.

Ok, thanks!
I'm yesterday looks again in Windows desktop settings and noticed that HDR enabled. I'm disabled HDR and left 120Hz 10-bit color, and after enable FreeSync in monitor. And colors became normal!
Looks like it's HDR problem.
After I'm tried to enable HDR and 8-bit color - colors fine. But HDR with 8 bit is no point with HDR, right?
After I'm enable 10-bit color and colors brokes again. But when I'm look at them more carefully I noticed that it's not banding - it's look like just colors distortion on semi-transparent dark windows.
After I'm tried to increase SDR brightnes in windows HDR settings, and after some of its value colors are corrected. Lower SDR brightness - colors break again.
It seems that in HDR incorrect SDR gamma with FreeSync.

HDR 10-bit without FreeSync - colors are normal, HDR 10-bit with FreeSync - gamma changes and SDR colors looks wrong till you don't increase SDR brightness!

FreeSync changes colors look or gamma? Can FS do that?