Hi All,
Please try with the EnableBrightnessControl =1 as kernel parameter or add it in 
xorg.conf file.
You can add it in device section as shown below - 

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVIDIA RTX A3000 Laptop GPU"
    Option         "RegistryDwords" "EnableBrightnessControl=1"
EndSection

After change in the xorg, please uninstall / install the driver.

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https://bugs.launchpad.net/bugs/1905591

Title:
  no brightness control in {455,460} after update from 450

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