[Nix-dev] nvidia proprietary / i7 notebook - does not start

[Marc Weber]

Desktop: Everything is fine, the way it should

Laptop: 
  lspci: 03:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940MX] (rev a2)
  => Ubuntu -> fine
  => Nixos -> black -> then blinking cursor, no (EE) lines in X log

I tried copying the relevant part from X.org defining drivers, screens,
monitors from Ubuntus config to no avail. Also setting BusID
AllowEmptyConfig and such didn't seem to work.

Has anybody experienced the same issue/ maybe even solved it?

Marc Weber