@Alberto, I switched back to Ubuntu 18.04 and now everything is working.
Now I can switch to Intel with low power consumption and no external monitor 
how it was ever, and when I switch back to Nvidia, I can use external monitor 
normally.

Next weekend I`ll try again with Lightdm and tell you, ok?

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https://bugs.launchpad.net/bugs/1778011

Title:
  SRU: PRIME Power Saving mode draws too much power

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