I havent found a solution so far for my problem after researching for hours and hours..

Basically my Laptop Screen is really really bright and I cannot turn it down with the fn keys. Although they show the sun and the value bar going up or down it does not change the brightness itself.

I am having this issue on any OS running. This is really unpractical as it drains the battery quicker and is really unconfortable to look at at night.


Try to add following line to /etc/default/grub


and then update the grub with following command

sudo update-grub
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