HDR flickering in DX11 @ 4K

HDR works in DX12 @ 4K with no flickering, but my fps is terrible with DX12. When I switch to DX11 (the only setting that is being changed) I get awful flickering akin to a strobe effect; thankfully I am not epileptic. 4K in DX11 is the only resolution that gives me flickering, Once I drop it to 1080p or 1440p the flickering disappears. OR if I turn off HDR @ 4K resolution then the flickering also disappears. Please help!

Update your GPU driver. If you have an Nvidia card, there is a new driver out (441.12).