When playing HEVC videos in KODI or PotPlayer using H/W DXVA some distortion or artifact is viewed. These squares are arranged diagonally like a set of stairs or mosaic effect.

Solution:

Intel’s contrast enhancement feature may be the culprit, you can disable this in the drivers control panel. Disable contrast enhancement in the video settings works fine for now.

Intel Graphics Settings > Video > Image Enhancement > Contrast Enhancement = Disable

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