Public bug reported:

Upgraded from 16.04 to 17.04, Dell 9350. Using version 1.6.2 of xinput.

Using libinput for touchpad, no Synaptics installed.

After a variable but short period (usually within 5 minutes) the tap to
click functionality of the touchpad stops working.

Nothing of note in syslog or dmesg.

Peculiarly, sudo libinput-debug-events --enable-tap continues to show
the correct output for taps (e.g. BTTN_LEFT etc) even after the UI stops
responding to taps. So it may well be that it is not libinput? But I had
to start somewhere!

What is the event handling chain after libinput? Any pointers towards
where I might look for an issue?

** Affects: xserver-xorg-input-libinput (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1685343

Title:
  Tap to click dies after a short period

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