2080TI HDR problems

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I have 4.4 running on a 2080TI with the latest drivers, running Windows 10.

The OS is set to HDR (PQ) mode and I am connected to a HDR compatible TV via HDMI. I am set to RGB / Full and all other games work great in HDR. Forza 4 is amazing btw!

But Prepar3D can only run HDR when windowed, bloom is there, colors look correct, not too dark, banded or washed out etc.

If I switch to fullscreen the TV flashes a message that HDR (PQ) is off and colors look dark (not right). Interestingly bringing up and focussing the ATC window (still in fullscreen) switches HDR back on and the image is corrected for a second.

ALT-Tabbing back to windowed also fixes it. In short I cannot use HDR in Fullscreen mode on the 2080TI, is this a known issue, is there a workaround?

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