If it doesn't, edit it with $ sudo nano /etc/X11/nf $ cat /etc/X11/nf should read: Section "Device" Should it be missing, create it: $ sudo ln -s /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness /sys/class/brightness $ cd /sys/class This directory should contain a soft link called brightness to the brightness device discovered in the previous step.Issuing $ find /sys -type f -name brightness should yield something like /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness.No joking, make sure that the appropriate drivers are actually installed: $ sudo apt install xbacklight xorg xserver-xorg-video-intel.$ sudo nano /etc/default/grub and replace the corresponding line with GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor".
Here is every step required for xbacklight control: Hardware brightness buttons 🔅 🔆 Since Ubuntu LTS 18.04
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