RTX2060 Kernel 5.4.0-51 dual screen

Hello I have an asus tuf505dv with:
xubuntu LTS 20.04
kernel 5.4.0-51-generic x86_64
Nvidia RTX2060
nvidia 450 driver.
my second screen in HDMI starts up but remains black.

I tried another screen that didn’t change anything and I tested the screen on my old laptop and it works fine.

I install and uninstall all the drivers, reinstall Xubuntu several times try ubuntu and tested the 18.

I saw on several forums that there were several of us in this case; not to find a solution.

I reinstalled nvidia prime with:
sudo apt install --reinstall nvidia-prime

Could you please help me find a solution?

i find solution here: https://forums.developer.nvidia.com/t/nvidia-xconfig-doesnt-do-what-i-want-it-to-nor-does-nvidia-settings/107883/6