NVIDIA's custom resolution is a great feature if you want to play games on a different resolution that is not exposed by your monitor by default. This can be handy if you would like to play the game at a slightly lower resolution to get some more FPS.
To do the opposite (playing at a higher resolution that your monitor supports), you can choose to use NVIDIA's DSR feature. Read more about this on NVIDIA's website.
However, for some of us this feature is greyed-out when opening NVIDIA's control panel:
There are several ways to fix this. Below we will describe a few possible fixes.
It is important to note that if you use a gaming monitor that supports 4K resolutions and high refresh rates (120 hz or more) these monitors often use a technology called Display Stream Compression (DSC in short), which is a compression algorithm designed to enable increased display resolutions and frame rates over existing physical cables (like DisplayPort), see Wikipedia.
In case DSC is enabled, you cannot enable the custom resolution feature, so you should disable DSC first. To do so, you need to enter into your monitor settings through your monitor OSD. Often you can enable or disable DSC in the SYSTEM part of your monitor settings. Keep in mind that this will severely lower the image quality, like a much darker image. To counter this, either use a lower refresh rate or resolution. Obviously this is not very optimal. So unless NVIDIA fixes this, we are literally left in the dark. As far as we know, there is no reason to disable custom resolutions in case you want to use a lower resolution than the standard resolution of your monitor. But so far we have not found a solution for the greyed-out setting in case DSC is enabled.
The same applies to NVIDIA's DSR. If DSC is enabled in your monitor settings, DSR will be disabled in NVIDIA's control panel.
If you have a second monitor, it has been reported that this also could disable NVIDIA's Custom Resolution. So, try to disable your second monitor to see if this fixes the issue.
Another reason the NVIDIA custom resolution may be disabled is because you have a refresh rate that is set too high. To see if this is the issue for you, first lower your refresh rate in Windows display settings to 60 herz, then add the resolution you want in NVIDIA Control Panel, and then reset the refresh again to to wat is previously was.
Another setting that could cause DSR and possibly also the NVIDIA Custom Resolution to be disabled, is Window's Snap feature. So try to disable this feature if you have it enabled.
To do so:
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