Dell Precision 5520/AlphaCubed's xf86-input-synaptics 5520 Touchpad Config

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Place the following in /etc/X11/xorg.conf.d/30-touchpad.conf and reboot your PC to apply it.

Section
    Identifier "Dell Precision 5520 Synaptics TouchPad custom xorg config"
    MatchIsTouchpad "on"

    Driver "synaptics"
    # natural scrolling, reverse scrolling under kde settings
    #Option "VertScrollDelta" "-111"
    #Option "HorizScrollDelta" "-111"
    # less pressure required
    Option "FingerLow" "25"
    Option "FingerHigh" "50"

    # palm detection, highly recommended to prevent accidental tap to click
        # turn off if issues
        Option "PalmDetect" "1"

    # LIBINPUT ONLY
    #Driver "libinput"
    #Option "Tapping" "on"
    #Option "Natural Scrolling" "on"
EndSection