Spectre X360, PopOS, the HDMI output stopped working again. Somehow the 470 driver got reinstalled. It is the 3rd time it happens and I am sure I did not do it this time. I followed my own instructions on how to get back to 465, but the Noveau driver, that is supposed to be disabled, managed to creep in again. I had to re-google on how to disable it. I am posting my updated complete popos-roll-back-to-465-instructions so that I have it easier next time:
#remove the current NVIDIA driver
sudo apt remove nvidia*
sudo reboot now
#disable the noveau driver
sudo bash -c “echo blacklist nouveau > /etc/modprobe.d/blacklist-nvidia-nouveau.conf”
sudo bash -c “echo options nouveau modeset=0 >> /etc/modprobe.d/blacklist-nvidia-nouveau.conf”
sudo update-initramfs -u
sudo reboot now
#install NVIDIA 465 driver
#downloaded from nvidia.com
chmod +x NVIDIA-Linux-x86_64-465.31.run
sudo ./NVIDIA-Linux-x86_64-465.31.run
sudo reboot now