<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Pointer jumps when using the rmi4 driver for precision touchpads"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100436">100436</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Pointer jumps when using the rmi4 driver for precision touchpads
</td>
</tr>
<tr>
<th>Product</th>
<td>Wayland
</td>
</tr>
<tr>
<th>Version</th>
<td>1.5.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>libinput
</td>
</tr>
<tr>
<th>Assignee</th>
<td>wayland-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>aduggan@synaptics.com
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=130512" name="attach_130512" title="Noticeable jumps when drawing diagonal line">attachment 130512</a> <a href="attachment.cgi?id=130512&action=edit" title="Noticeable jumps when drawing diagonal line">[details]</a></span>
Noticeable jumps when drawing diagonal line
Versions 1.5 and higher seem to have introduced jumps in the pointer motion for
data being reported using the RMI4 driver. On example is when moving in a
descending diagonal line from right to left the pointer will jump down and then
back into position. It maybe that the new acceleration code is amplifying the
motion. Here is the link to the kernel mailing list discussing this issue.
<a href="https://marc.info/?l=linux-kernel&m=148998603125837&w=2">https://marc.info/?l=linux-kernel&m=148998603125837&w=2</a>
There is probably a kernel component which is contributing to this. But, since
the jumps are much more noticeable on newer versions of libinput I thought it
was worth looking into on the libinput side.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>