Hello, how are you friends? 
I use Arch Linux (many know that, hehe). The thing is, my laptop's touchpad (Synaptics touchpad) works normally; that is, I move my finger over the area and the pointer moves, but it doesn't scroll vertically, and when I press with a finger on the area it doesn't function as a click or anything similar.
The thing is that I had to manually configure the touchpad, and here are the steps 
1. Open a terminal.
2. Write the following on it:
sudo kate /etc/X11/xorg.conf.d/10-synaptics.conf
It will ask for your password, type it in and press [Enter]
3. In the document or text file that will be opened, you must paste what I left HERE.
4. Once it's glued there, they store it and close it.
5. Done, restart and the touchpad should be fully functional 
If you want to make any changes, questions, questions or whatever, let me know.
regards