Ubuntu 20.04 Brightness Control Setting Unavailable

I installed Ubuntu 20.04 in my Asus ROG Zephyrus GA502IU. It has AMD Ryzen 7 4800HS CPU and NVIDIA GeForce GTX 1660 Ti Max-Q GPU. I am unable to control brightness in Settings as it is not there (missing). I am unable to control it via Fn + (F7 | F8) (most of my Fn+F# keys aren’t working, but I think it is unrelated to this post). I am currently using proprietary driver nvidia-driver-440.

I currently have modified /etc/default/grub to include nouveau.modeset=0 as Ubuntu won’t boot without it.

Things I’ve tried:

• Modify /etc/default/grub‘s GRUB_CMDLINE_LINUX_DEFAULT to include acpi_backlight=vendor, acpi_backlight=default, acpi_osi=!, acpi_osi= to no avail.
• Blacklist asus-nb-wmi inside /etc/modprobe.d/blacklist.conf
• Tried using xrandr where there are no screen brightness changes:

$ xrandr -q | grep connected
xrandr: Failed to get size of gamma for output default
default connected primary 1920x1080+0+0 0mm x 0mm

$ xrandr --output default --brightness 0.8
xrandr: Gamma size is 0.

Thank you for reading and thank you in advance for your help!