Custom Resolution Utility (CRU)

[kristianity1977]

(01-27-2026 09:26 PM)MUC Wrote:  

(01-27-2026 06:47 PM)kristianity1977 Wrote:  Ive noticed a side effect of this is that HDR has stopped functioning.

I can't confirm that. I did the following test:

• I advertised the yesterday's EDID to my RTX 50 graphics card using an external emulator.
• When I then also imported the EDID into CRU, there were no changes, meaning the graphics driver read the EDID correctly from the HDMI port’s DDC (Display Data Channel).
  

I can select up to 4K @ 120 Hz RGB 10-bit with HDR and VRR (see attachment).

According to general understanding, EnableTiledDisplay = ZERO only prevents the graphics driver from offering settings that would result in the output signal having a pixel clock of more than 1350 MHz (RTX 30 and 40) or 2700 MHz (RTX 50). This actually has nothing to do with HDR.

Perhaps you made a careless mistake during the import process. It's almost always advantageous to select the "Import complete EDID" checkbox when importing an EDID into CRU to avoid ending up with an undefined mix-up in the registry. Did you do that? If not, you should probably do it. When experimenting with CRU, always make sure you know how to boot the system into safe mode in case of an emergency. This prevents Windows from loading the Nvidia graphics driver, which, with an EDID incompatible with the display, would then fail to show a signal.

Sorry. What I mean is, im getting the same message as you in that windows is showing that HDR is supported, but its not actually working even though windows reports that it is.

For example, with everything at default (so no Regedit, and no EDID import) then HDR, and RTX HDR are working as intended. (With RTX HDR I can see this as an option in Nvidia APP.

As soon as I do the regedit and import the EDID, HDR is showing as working still, but it isnt working in games and RTX HDR vanishes from the Nvidia APP and doesnt work in the Nvidia Overlay.

Resetting everything again to default makes it work again

On my attached image is the nvidia APP and where RTX Dynamic Vibrance is, under normal circumstances is RTX HDR. The second image shows my Nvidia App when everything is at default

Normal HDR in game, toggleing ON or OFF makes no difference to the image. So even though windows shows HDR as working, its not