Anlaşılan 9’da durum değişmiş.
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Change to libinput Xorg driver in Debian 9 "Stretch"
The synaptic Xorg driver in being superseded by the newer libinput driver, which can provide lower-level access to multi touch events to clients, but is currently lacking some features found in the older driver.
You can make the synaptics driver take precedence over libinput by copying /usr/share/X11/xorg.conf.d/50-synaptics.conf into /etc/X11/xorg.conf.d, so as to make it take precendence over the libinput configuration file found at /usr/share/X11/xorg.conf.d/90-libinput.conf.
The synclient and syndaemon commands don’t work with the libinput driver and will instead exit with an error message such as:
Couldn’t find synaptics properties. No synaptics driver loaded?
Unable to find a synaptics device.
The synaptics driver is provided by xserver-xorg-input-synaptics. The libinput driver is provided by xserver-xorg-input-libinput.
To reenable a disabled touchpad in gnome on stretch:
gsettings set org.gnome.desktop.peripherals.touchpad send-events ‘enabled’