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I want to dim brightness in my system way below the currently available setting. I found this method which helps to set a minimum brightness value. But the problem is if I ever change the brightness then the minimum brightness moves back to the default value. To dim the brightness again, I have to rerun sudo su -c "echo 2070 >/sys/class/backlight/intel_backlight/brightness" . How do we permanently change the default brightness value?

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The best way i with sysfsutils.

sudo apt install sysfsutils

create in under folder /etc/sysfs.d/ a file named brightness.conf with following content. The name has to and with suffix .conf

class/backlight/intel_backlight/brightness = 2070

Restart service

sudo systemctl restart sysfsconf.service 

sorry for link but I can not explain in english.

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