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I'm trying to change the brightness of my screen in Ubuntu 18.04 pressing the keyboard Fn+F4 and Fn+F5 keys, but it's freezing all keyboard input, then changing brightness to max (Fn+F5) or min (Fn+F4). I searched in google for a solution and I was not successful. I have just a clue of the problem, that I found using the following command:

"journalctl -f"

I got the following log:

Log of journalctl presing Fn+F5

Ps.: I can change the brightness by gnome's interface using the mouse normally.

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