https://bugs.freedesktop.org/show_bug.cgi?id=105963

            Bug ID: 105963
           Summary: Lenovo P50 - Slow fine touchpad movement makes it jump
                    (bug 2)
           Product: Wayland
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs@lists.freedesktop.org
          Reporter: t...@tim-richardson.net

as requested https://bugs.freedesktop.org/show_bug.cgi?id=105022#c40 
making a new bug report, following on from that comment:

Tim:
can we move this to a separate bug please? This one is too noisy to still
figure out what's going on. As a general tip - when you're working on libinput,
put printfs in everywhere and run either sudo ./build/libinput-debug-events
(commandline) or sudo ./build/libinput-debug-gui (a GUI). No need to install
and restart X just for basic testing.

If even the above makes no difference, it's likely that the model flag is never
applied, put a printf in for that in evdev.c. 

> I plan to understand the acceleration logic and change it somehow, so that 
> there must be a certain number of events before acceleration is applied, 
> similar to the idea in the code above.


That's an interesting idea. We previously had code that we required N events
for the pointer to start moving, but that didn't work well, too laggy. But not
having acceleration for the first N events could work (N <=2, I suspect...)

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