I finally managed to make it work. In order to do it, I had to recompile the kernel as suggested here.
Adding
if (pin == 44)
pin = 140;
on line 127 of drivers/gpio/gpiolib-acpi.c did the trick.
My dmesg showed some problems with gpio just before the i2c_hid error messages, so if it is...
I installed Ubuntu 20.04 on my Elimina (the 15,6" version) and I have encountered the first problem too. I managed to make the touchpad work by using psmouse module (sudo modprobe psmouse proto=imps) but it is far from being an optimal solution since the touchpad only works as a mouse (no...