<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><span class="vcard"><a class="email" href="mailto:peter.hutterer@who-t.net" title="Peter Hutterer <peter.hutterer@who-t.net>"> <span class="fn">Peter Hutterer</span></a>
</span> changed
<a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - SynPS/2 Synaptics TouchPad detects fingers not touching the touchpad while using two-finger scrolling"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105535">bug 105535</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Depends on</td>
<td>
</td>
<td>105258
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEEDINFO
</td>
<td>ASSIGNED
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - SynPS/2 Synaptics TouchPad detects fingers not touching the touchpad while using two-finger scrolling"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105535#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - SynPS/2 Synaptics TouchPad detects fingers not touching the touchpad while using two-finger scrolling"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105535">bug 105535</a>
from <span class="vcard"><a class="email" href="mailto:peter.hutterer@who-t.net" title="Peter Hutterer <peter.hutterer@who-t.net>"> <span class="fn">Peter Hutterer</span></a>
</span></b>
<pre>oops, the range mismatch is fixed in master now (4ff5f02d9c). But the big thing
here is:
<span class="quote">> As for single-finger pointer motion - it's normal. Bug does not not appear there.</span >
Basically this means that the touchpad pressure changes when two fingers are
down. That's not good... Anyway, I bisected this and came up with: commit
3979b9e16a5ed141506d95f80ddfd7b94651dcfa. Basically the problem is that we now
assume that when we have more fingers down than the touchpad can individually
detect (>1 for semi-mt devices) then we assume all fingers have an
above-threshold pressure value.
This matches the data in the evemu recording, the pressure is well below the
thresholds yet we treat it as down. Should be fixable.</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - libinput crashes Xorg with SIGABRT in tp_tap_handle_state() [evdev-mt-touchpad-tap.c:1030|1028]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105258">Bug 105258</a>] libinput crashes Xorg with SIGABRT in tp_tap_handle_state() [evdev-mt-touchpad-tap.c:1030|1028]
</li>
</ul>
</div>
<br>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>