After installing Kubuntu 20.10 on my laptop with a NVIDIA Geforce GTX 1650 card, I can't lower the screen brightness. I have also installed the latest version on the Geforce GTX 1650 driver from the NVIDIA website.
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rm /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf
to remove the file you just created then reboot your system and [edit] to add the output ofsudo lshw -C display
andlspci | grep -i vga
– Raffa Jan 11 '21 at 16:37