Ubuntu 18.04 still uses llvmpipe driver #2

You have a hybrid amd/nvidia graphics combo and the amd is primary and running llvm, so it’s missing the driver.
I guess it’s this:
https://forums.developer.nvidia.com/t/ubuntu-18-04-second-monitor-couldnt-be-detected-using-nvidia-430-form-ppa/125606/3
For non-guessed info, please run nvidia-bug-report.sh as root and attach the resulting nvidia-bug-report.log.gz file to your post. You will have to rename the file ending to something else since the forum software doesn’t accept .gz files (nifty!).

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