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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.

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

acpi_backlight=none

and then update the grub with following command

sudo update-grub
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