I confirm what zob wrote. I switched from Discrete to Hybrid mode in BIOS and 
now touchpad work fine. I use Nvidia proprietary driver from ubuntu standard 
repository (440.64), my only problem is screen tearing (PRIME profile set to 
performance mode). I don't know if the drivers from PPA repository fix touchpad 
and tearing problem. I read that Nvidia 440.66.11 Linux driver fixes annoying 
bugs With PRIME Sync: 
https://www.phoronix.com/scan.php?page=news_item&px=NVIDIA-440.66.11-Linux.
Previously I used the card in discrete mode with Fedora 31 and the proprietary 
Nvidia drivers 440.82 from RPM Fusion repository without any problems for 
touchpad or for tearing.

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which is subscribed to xserver-xorg-input-libinput in Ubuntu.
https://bugs.launchpad.net/bugs/1826597

Title:
  Synaptic touchpad not responding in ubuntu 19.04  when using nvidia
  drivers

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