Okay this is all less than clear at least for me. I have discovered how it does works with the help of folks on this tread and what I tried and found for myself.
1. Set Display to Adaptive
2. While still in the Display setting
3. Select Brightness
4. Uncheck Automatic brightness
5. Select a...
Thanks, but this would only be valid if power saving is on I would think. Even as that might be the case I did give it a try by setting it and then turning power savings back off, still not luck.