Color Banding in Rhinoceros 6 and 7

Hello, I’ve a problem Using Rhino (6 or 7 have the same problem) with my new laptop with 2 Graphic Cards installed.
the first one is an Intel UHD Graphics P630
the second one the NVIDIA Quadro T2000 with Max-Q Design.
In the render view visualization I have a color banding problem.

Do you know how I can solve the problem?
Thank you

A post was merged into an existing topic: Display issue: color banding