Well, I have been able to solve the problem and I am able to use nvidia driver 
again. The problem is that nvidia-prime blacklist nvidia driver. The file is 
"/etc/modprobe.d/blacklist-nvidia.conf" with content:
# Do not modify
# This file was generated by nvidia-prime
blacklist nvidia
blacklist nvidia-drm
blacklist nvidia-modeset
alias nvidia off
alias nvidia-drm off
alias nvidia-modeset off

File was never re-established, even when uninstalling/purging nvidia-
prime package. I think that this file should be re-established/deleted
when you uninstall nvidia-prime.

Thanks Alberto and other maintainers for your hard work maintaining
nvidia packages (

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  nvidia-prime can't switch off the discrete GPU

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