[Wayland-bugs] [Bug 105850] Clickpad drag lock sometimes activates

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105850

--- Comment #2 from Jonathan Heathcote <mail at jhnet.co.uk> ---
> read: clickpad is physically down
> read: a finger is down in position x/y with pressure
> read: finger is up again, no finger is on the touchpad.
> read: a finger is down again, 1.7 seconds later

Am I correct in understanding that the clickpad is failing to report that the
clickpad is released on occasion? Or is there a race between the clickpad event
and touch event and in my hardware, the click is occasionally arriving before
the touch?

If the former, what an odd hardware issue... If the latter, should this not be
handled since the relative timings of click/touch events may not be guaranteed?

> This is a hw problem, i think your clickpad is simply wearing out. You could 
> probably test this by clicking the touchpad with a pen (something that doesn't 
> get detected by the touchpad) and see if that triggers the BTN_LEFT up event.

Here's the result of pressing and releasing the button with a pen:

    E: 0.000001 0001 0110 0001      # EV_KEY / BTN_LEFT             1
    E: 0.000001 0000 0000 0000      # ------------ SYN_REPORT (0) ----------
+0ms
    E: 0.095194 0001 0110 0000      # EV_KEY / BTN_LEFT             0
    E: 0.095194 0000 0000 0000      # ------------ SYN_REPORT (0) ----------
+95ms

After trying quite a number of times, I've not seen either event go missing
yet. Is this correct behaviour?

(Thanks again for your help!)

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