Debian 9 zaměnil synaptic za libinput.

Konfigurační soubory zde

/usr/share/X11/xorg.conf.d
/etc/X11/xorg.conf.d

Moje nastavení touchpadu

/etc/X11/xorg.conf.d/30-touchpad.conf

Section "InputClass"
    Identifier "touchpad"
    Driver "libinput"
    MatchIsTouchpad "on"
    Option "Tapping" "on"
    Option "VertTwoFingerScroll"   "1"
    Option "DisableWhileTyping" "on"
    Option "TappingButtonMap" "lmr"
EndSection

Další volby

Option          "MinSpeed"              "0.5"
Option          "MaxSpeed"              "1.0"
Option          "AccelFactor"           "0.075"
Option          "TapButton1"            "1"
Option          "TapButton2"            "2"     # multitouch
Option          "TapButton3"            "3"     # multitouch
Option          "VertTwoFingerScroll"   "1"     # multitouch
Option          "HorizTwoFingerScroll"  "1"     # multitouch
Option          "VertEdgeScroll"        "1"
Option          "CoastingSpeed"         "8"
Option          "CornerCoasting"        "1"
Option          "CircularScrolling"     "1"
Option          "CircScrollTrigger"     "7"
Option          "EdgeMotionUseAlways"   "1"
Option          "LBCornerButton"        "8"     # browser "back" btn
Option          "RBCornerButton"        "9"     # browser "forward" btn