Custom Resolution Utility (CRU)

[DevilInDisguise]

Just a random bit of information: after seeing Nvidia's message, I tried switching from GPU scaling to Display scaling.
It solved the issue with the malfunctioning Nvidia Control Panel. Now I can modify the EDID for all displays without the control panel bug.

Quote:High bandwidth monitors are those that support display modes requiring high pixel clock rates, which in turn demand more GPU resources. The threshold for what qualifies as "high bandwidth" varies by product. On Blackwell GPUs, any mode operating above 1620 MHz is considered high bandwidth. For instance, the 7680x4320@60Hz mode defined in the CTA-861-H specification runs at 2376 MHz, making it a high bandwidth mode for Blackwell.

These monitors typically support display scaling natively. However, in some single-monitor setups, users may still prefer GPU scaling. When multiple monitors are connected to a GPU and at least one of them is high bandwidth, that monitor will default to display scaling only. GPU scaling is disabled in this case due to bandwidth limitations. Notably, display scaling can be more efficient than GPU scaling in such scenarios, as it reduces the bandwidth load on display cables—especially at higher refresh rates.

When GPU scaling is not enabled for a monitor, only the modes supported by the monitor itself will appear in both the Windows and NVIDIA control panels. Additionally, the "Display scaling" option will be pre-selected in the "Adjust desktop size and position" section of the NVIDIA Control Panel.