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Jelly Comb WGJP-012 on Debian 10

To use the cheapo USB touchpad branded as Jelly Comb WGJP-012 on Debian 10 Buster, you might have to do a bit of tweaking.

  1. Make sure you have xserver-xorg-input-libinput, xserver-xorg-input-evdev and server-xorg-input-mouse installed.

  2. Make sure you do not have xserver-xorg-libinput-synaptics installed.

  3. Create a file /etc/X11/xorg.conf.d/40-libinput.conf with the following contents.

    Section "InputClass"
        Identifier "libinput touchpad catchall"
        MatchIsTouchpad "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
        Option "Tapping" "on"
    EndSection
    

After a reboot, you should be able to left-click (single tap), right-click (tap with two fingers) and scroll (swipe with two fingers.)

(Infos taken from the Debian Wiki, but shortened for the Jelly Comb touchpad.)