sudo apt update
sudo apt install brightnessctl
brightnessctl -l
Replace YOUR_DEVICE in command with device name you saw from above list command.
sudo brightnessctl --device='<YOUR_DEVICE>::kbd_backlight' set 1
sudo apt update
sudo apt install brightnessctl
brightnessctl -l
Replace YOUR_DEVICE in command with device name you saw from above list command.
sudo brightnessctl --device='<YOUR_DEVICE>::kbd_backlight' set 1