screen brightness

Hello, After updating to window 10 (originally having windows 7) the screen brightness flickers from dim to normal again randomly. I tried fixing it by Display –> Enable adaptive brightness, and change the settings there to Off. which did not change anything. It was suggested updating drivers...

I have a Lenove Ideapad z400 that came with Windows 8. Ever since I “upgraded” from Windows 8.1 to 10, the brightness adjust buttons immediately make the screen change to the lowest brightness setting – unusable in all but near-darkness. - The first time it happened, I updated the graphics...