11-26-2019 10:05 PM
after updating bios on 2019 november, i cant adjust screen brightness, it always full brightness
when i click fn+F8 or F9, it show brigthness adjust on screen, but the brightness itself doesnt change
11-27-2019 03:34 AM
Welcome to Lenovo Community Forums.
Kindly access safe mode and observe if you'll be able to adjust the screen brightness again.
If still the same, try to perform a clean boot where it starts with a minimal set of drivers and startup programs, so that you can determine whether a background program is interfering with your laptop.