dell laptop keyboard not working properly

Question Toshiba Backlit Keyboard question

changing in BIOS setup (here I could turn the lights on or off, but this didn't solve the problem when my laptop was turned on and logged in) updating drivers (System drivers, Function key utility.) changing from 'special functionkey mode' to 'standard F1-F12 mode' The backlit problem came back to my memory and therefore I post here, to hopefully get a solution. Last week, I did a factory reset and again had some problems with the hotkeys. This problem started to occur when I updated to Windows 10 several years ago. (The lights are activated by pressing FN+W, because it's an azerty computer.)

If they're on at that moment, they stay on and it's impossible to turn them off again and vice versa. After around 5 seconds, there is no turning back. Sometimes I manage to turn the lights on, but this is only possible in the first 5 seconds after Windows started up (and thus the first seconds I can see my desktop). The function to activate the backlights of my keyboard doesn't work as it should.

Dell laptop keyboard not working properly