To change the behavior of the Synaptics/Alps
touch pad, use Control Panel - Desktop - Adjust Touch Pad. If Adjust Touch Pad errors when you launch it, your
touch pad is probably not supported yet, see libinput below.
Here’s a couple popular options to adjust :
Option "MaxTapTime" "0" This option sets the touch to tap behavior. Setting this to 0 disables touch to tap (which is the default). If you want touch to tap on, change this to 125 to start with and adjust as needed.
Option "AccelFactor" "0.030" This option sets how fast the mouse moves as you drag your finger across the pad. A smaller number is slower, a bigger number is faster.
By default "tap-to-click" is disabled as some touchpads are overly sensitive, making the system impossible to use if it is left on. To turn it back on:
To enable vertical scrolling, open Adjust Touchpad as above, then go to "Scrolling" tab and check "Vertical Edge Scroll" and uncheck all the others.
If you need other configuration options take
a look at the man page for Synaptics.
If Synaptics doesn't support your touchpad
use the Gslapt package manager to install libinput and
xf86-input-libinput and then restart X. Libinput is used for
Wayland input devices and xf86-input-libinput is a wrapper so
Xorg-server can use it. It does not have all the options that
the Xorg Synaptics driver offers, but it's better than
nothing. On my laptop using libinput tap to click is disabled
and two finger scrolling is enabled.