madVR v0.91.11 released
https://forum.doom9.org/showthread.php?p=1810890#post1810890
　* fixed: HDR metadata via Nvidia's private API was broken in 64bit
　* added workaround for driver bug in Nvidia's private HDR API
　* improved Windows 10 HDR metadata support
　* D3D11 windowed mode now supports 10bit, if "HDR and Advanced Color" is on
　* improved AMD native 10bit DXVA decoding; drivers are still broken, though
　* downscaling after doubling now uses relaxed AR only for NGU Sharp + Standard


あと、その次のポストでmadshi氏がHDRメタデータのパススルーについて書いてる。

HDR metadata passthrough
https://forum.doom9.org/showthread.php?p=1810891#post1810891