Oh,no! I'm wrong. I said it worked, but I was trying with sudo! Sorry.
And now I am stack.
I don't think I'm doing correctly this part:
sudo chown $(whoami):$(whoami)
/sys/class/backlight/intel_backlight/brightness
Should it be
sudo chown jane:jane /sys/class/backlight/intel_backlight/brightness
?
I don't get any answer when entering it.
And then, I do not know if I am entering properly the commands to change the
brightness without sudo. How should these commands be without sudo:
echo 500 | sudo tee /sys/class/backlight/intel_backlight/brightness
Thank you. As you see, I'm an absolute beginner.
