I'm using a Lenovo Y740 laptop (with an RTX 2060 video adapter) with Ubuntu 18.04.4 dual boot with windows 10 installed. The screen brightness is always at max brighness and I'm unable to change it.
I already tried 3-4 solutions provided across the internet but fails to fix the problem. I hope anyone read this and help me.
default kernel version is 5.3.0-40-generic (some source says upgrading the kernel will help, i have not tried this yet)
nvidia driver 440.59 (i know its rather new but dunno if this the problem, should i downgrade it ?)
when i run this command ls /sys/class/backlight/ it shows intel-backlight.
currently i can change screen brightness using brightness controller app but i prefer fixing the system (if any problem exist possible).
5.editing grub and adding conf file for intel is not working.
Some fix i already tried :