A barebones +/- UI controls for brightnessctl.
You need brightnessctl installed first in your system:
sudo apt-get -y install brightnessctl
After that it should work just fine. Just use the + and - buttons to adjust your display brightness.
When you're lazy to fix the same keyboard issue for the nth time and dunno this time it's hardware or software which causes it.
Also when you're already tired typing the same command over and over again.