Thanks for the assistance!
I tested kernel v4.8.0-040800-generic and it didn't fix the bug.
Regarding tags assigned.
Further two things for info (nothing new, just for the sake of completeness):
- I've a dualboot and the touchpad works on windows.
- System Settings -> Input Devices -> Touchpad shows red error message
"Synaptics backend not found"
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-bug-exists-upstream
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Touchpad not detected
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