Unreal Engine 4.21 Released!

[Xaymar]

@anonymous_user_41845f4a

Hello,

Thank you for letting us know this was occurring!

From looking at the information I can find about this issue internally, I cannot find any evidence of a bug report being entered and I do not believe we ever had a reproduction of it. Can you please enter a bug submission for this issue using our Bug Submission form? Please provide as much information as possible, including your DxDiag information. Even before that, I’m going to try to follow up because I believe this issue may of been dismissed due to the lack of reproduction.

Hi ,

I’ve reported the issue again, it’s actually quite simply to get it to happen yourself:

1. Install Nvidia Driver 4xx.xx on a recent (Pascal, Turing) GPU.
2. Attach a HDR Display, make it the primary one.
3. Disable HDR in Windows Settings
4. Launch Unreal Engine 4, it should now flicker off and on whenever a new windows is created.

This can be avoided by turning Windows HDR on, but Windows is generally awful at HDR it turns out and for some reason values from (0, 0, 0) to (10, 10, 10) end up super bright on the display. Which means that Unreal Engine 4 will look awful on that monitor, unless I manage to launch UE4 in HDR mode on it (-hdr -d3d12, r.hdr.enablehdroutput 1, r.hdr.display. stuff) - or if I get back the ability to use UE4 in SDR mode. This problem affects all compiled games too, so it’s not unique to just the Editor - it’s just easier to reproduce it with the editor.