How to enable trackpad tap to click in SDDM login page?

Solution 1:

Source: github

If SDDM is running on Xorg, and you use libinput, just add Option "Tapping" "on" to a xorg conf file in /etc//X11/xorg.conf.d/ You can use this:

sudo vim /etc/X11/xorg.conf.d/20-touchpad.conf

Paste the following:

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

        Option "Tapping" "on"
        Option "NaturalScrolling" "on"
        Option "MiddleEmulation" "on"
        Option "DisableWhileTyping" "on"
EndSection