Tried to install Elementary OS 5.1 on my Vaio Vjfe41f11x, the touchpad didn't worked on the installation, and neither on the installed system at all. Tried to install Ubuntu 20.04, touchpad worked on installation, but on the first boot on installed SO it didn't work at all, rebooting it, it worked, after reboot again, it didn't, and kept on this cicle for a while. After rebooting 4 or 5 times, it stopped working at all. When it isn't working, xinput and cat /input/devices don't show any touchpad/mouse.
Tried reinstall Elementary OS 5.1 three times, trying to find a way to use it, but it seems to be really impossible, sadly