I have followed many instructions in the past and now things are bad. Like: Suppose if I sleep and wake up my laptop, I have to toggle the brightness again in order to make my PC realize what was my brightness level.
This happens also when I restart or start my laptop.
The weird thing is there is certain brightness level, let's say its 50% showing up in brightness panel but until and unless I don't toggle it, PC doesn't respond to that amount of brightness.
I use Ubuntu 19.04.