♡ I found a solution! Hopefully someone finds this useful. I probably did more steps than required but here is what worked for me. ♡
(Nvidia users only)
1a) Open Terminal and enter the command below to open the xorg.conf file for editing:
sudo gedit /etc/X11/xorg.conf
2a) Once the file opens, find Section “Device” and add –> Option “RegistryDwords” “EnableBrightnessControl=1″ (as shown below in bold line), and hit Ctrl+S to save it.
**In my case, this file was empty so I entered the exact text and saved it to /etc/X11.
Identifier “Default Device”
Option “NoLogo” “True”
Option “RegistryDwords” “EnableBrightnessControl=1″
**After restarting, if this did not work for you I also did the following:
1b) Just create a file in /etc/X11/xorg.conf.d/50-nvidia.conf with the following content:
Option "RegistryDwords" "EnableBrightnessControl=1"
*Again, in my case some of these files didn't exist so I created them myself. When everything was in place I restarted and now my brightness controls are working
In order to create them manually open terminal and enter:
From there on navigate to: /etc/X11/ and create a folder named xorg.conf.d
Then inside that folder create a file named 50-nvidia.conf using gedit with the content listed in the step 1b
Now restart your computer.
♡ I hope this works for someone!♡