Not able to reduce Laptop Brightness on Ubuntu 20.04

I have a lenovo legion y540 with ubuntu 20.04 LTS on my ssd and windows on the hdd. I'm not able to change the brightness while in ubuntu. I've tried downloading the "Brightness Controller" but using it changes nothing.
I also tried following the following article - https://vitux.com/control-screen-brightness-from-ubuntu-terminal/


However from the above article the output given below for Code:xrandr | grep " connected" | cut -f1 -d " " -
Quote:

xrandr: Failed to get size of gamma for output default default

The output for Code:lspci|grep VGA is -
Quote:

01:00.0 VGA compatible controller: NVIDIA Corporation TU117M [GeForce GTX 1650 Mobile / Max-Q] (rev a1)

I also tried
Code:ls -l /sys/class/backlightI got
Quote:

total 0 lrwxrwxrwx 1 root root 0 Oct 25 12:22 ideapad -> ../../devices/pci0000:00/0000:00:1f.0/PNP0C09:00/VPC2004:00/backlight/ideapad

I really need to be able to change the brightness. Any sort of help would really be appreciated. Since this is my first post I tried to give as much information as I could that came to my head, if anything else is required do let me know I would update it.

Thanks a lot.