After the last Windows 10 update from 9th Oct 2018, my Lenovo T450s laptop is not capable anymore to adjust brightness. Hotkeys not working not the slide bar for Display Brightness. I can slide up or down but the screen does not change brightness level. I've tried all kind of solution after surfing the net, from updating video adapter drivers from intel and from lenovo as well, monitor drivers, changed FeatureTestControl registry key, but nothing works.
Please help with other ideas.