There is some driver level documentation about the OpenAdapter12 calls, but I found the older OpenAdapter10 documentation easier to find. When I get a chance, I'm going to hook the RtlGetVersion also and lie about the OS version and see what happens. I used APImonitor to watch all the calls in nvwgf2um and it's definitely some sort of feature/hardware checking/lookup including for DX12 support. It doesn't seem to use registry for that, but I'm not sure where it gets the number. It bypasses the normal GetVersion call for this hidden one. The version checking in the DLL doesn't solely use the registry versions, it also calls out to ntdll.dll for RtlGetVersion. I don't know that I looked on later versions. I think the 3D flag in the OS still exists on 1903, because when I run driver 425.31, I still see the flag in their UI. It is indeed complicated to reverse engineer this hunk of code, especially as it's not well documented. Not sure of course, just passing along, and writing down some research. My best guess at the moment is that Windows 1903 and above knew that Nvidia canceled 3D Vision, and use some sort of version as the decision to not show the 3D button in their UI. It figures out what all features are available, including 3D I think.

The driver is provided by nvidia, but the requests and design of the dll is Microsoft. The nvwgf2umx.dll is how the OS figures out the capabilities of the card itself.

We would be in dire straits by now.Īfter digging into the guts of it a bit- I believe that the branch instruction that you found is somehow related to the 3D on/off setting in Windows itself. He will make this the default approach for an upcoming 3DFM update as well, but also keep the global driver fix for cases where it's not possible to run a changed 3Dmigoto in a Thanks again for the killer work on finding the workaround for the driver. PaulDusler and I have been working out the bugs, and it seems to work pretty well. It still uses the Schwing hack, but only applies it on a per-game basis, so you don't have to do anything except click Pla圓D or PlayInVR in the UI. It doesn't seem like anyone is interested, but the beta_driver branch of HelixVision has pioneered a new approach for driver hacking that is plug-n-play. UE4 games in particular will simply crash at launch without it. Yeah, that sounds like you are missing the famous Schwing hack to keep drivers running past 430.39.

Reinstalling graphics drivers