I have upgraded my Debian 8 to Debian 9 and found out that side touchpad scrolling stopped working on my Lenono G560. Has anyone experienced something similar? I found thatThe synaptic Xorg driver in being superseded by the newer libinput  driver, which can provide lower-level access to multi touch events to  clients, but is currently lacking some features found in the older  driver. You can make the synaptics driver take precedence over libinput by copying   /usr/share/X11/xorg.conf.d/50-synaptics.conf into /etc/X11/xorg.conf.d, so   as to make it take precendence over the libinput configuration file found   at /usr/share/X11/xorg.conf.d/90-libinput.conf. Yet after doing those steps the problem persists.
Touchpad scrolling stopped working after Debian 9 upgrade
debian;upgrade;touchpad