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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Lenovo P50 - Slow fine touchpad movement makes it jump (bug 2)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105963">105963</a>
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<th>Summary</th>
<td>Lenovo P50 - Slow fine touchpad movement makes it jump (bug 2)
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<th>Product</th>
<td>Wayland
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>libinput
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<th>Assignee</th>
<td>wayland-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>tim@tim-richardson.net
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<pre>as requested <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - Lenovo P50 - Slow fine touchpad movement makes it jump"
href="show_bug.cgi?id=105022#c40">https://bugs.freedesktop.org/show_bug.cgi?id=105022#c40</a>
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.
<span class="quote">> 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.</span >
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...)</pre>
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