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<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 - Apple Magic Trackpad scrolling prevented by speed-based thumb detection (libinput 1.10)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105696">bug 105696</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Summary</td>
<td>Apple Magic Trackpad scrolling sensitivity too low (libinput 1.10)
</td>
<td>Apple Magic Trackpad scrolling prevented by speed-based thumb detection (libinput 1.10)
</td>
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<td style="text-align:right;">Status</td>
<td>NEEDINFO
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<td>ASSIGNED
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<td style="text-align:right;">CC</td>
<td>
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<td>benjamin.tissoires@gmail.com
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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - Apple Magic Trackpad scrolling prevented by speed-based thumb detection (libinput 1.10)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105696#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - Apple Magic Trackpad scrolling prevented by speed-based thumb detection (libinput 1.10)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105696">bug 105696</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>First I think there's something wrong with your kernel
E: 0.253846 0001 0145 0002 # EV_KEY / BTN_TOOL_FINGER 2
I haven't seen that before, a repeat event for BTN_TOOL_FINGER? Benjamin, any
ideas? Also, the slot association is strange, usually the slot numbers match
the fingers down and get re-used, this recording seems to use them in seemingly
arbitrary order. That's generally fine, just unusual.
Back to libinput: the issue is definitely the touch size threshold, there are
only few events below 60, followed immediately by events above the threshold.
The problem appears to be:
event25 - touch 7 is speed-based thumb
event25 - touch 2 is speed-based thumb
event25 - touch 4 is speed-based thumb
event25 - touch 10 is speed-based thumb
This appears before every POINTER_MOTION sequence when two fingers are down. In
short, the problem here is that the second finger is detected as thumb after
the first finger moved. Not 100% sure yet why this happens, e.g. 3.712742
starts touch 7 after a single event of touch 9. We require 4 events for
speed-based thumb detection though, so this simply shouldn't happen. I'll try
to dig into this.</pre>
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