Not only "sudo dpkg-reconfigure xserver-xorg" detect the touchpad but
also tpconfig:
$ sudo tpconfig -i
Found Synaptics Touchpad.
Firmware: 8.96 (multiple-byte mode).
Sensor type: unknown (0).
Geometry: rectangular/landscape/up.
Packets: absolute, 80 packets per second.
Corner taps disabled; no tap gestures.
Edge motion: none.
Z threshold: 6 of 7.
2 button mode; corner tap is right button click.
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Synaptics touchpad not detected
https://bugs.launchpad.net/bugs/191024
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