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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - 'Apple touchpad bcm5974' unresponsive after "palm: touch size exceeded" on 'Apple MacBookPro5,4 (mid 2009)' with 1.10.4 (Ubuntu 18.04), worked fine with 1.8.2 (Ubuntu 16.10)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106489">106489</a>
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<th>Summary</th>
<td>'Apple touchpad bcm5974' unresponsive after "palm: touch size exceeded" on 'Apple MacBookPro5,4 (mid 2009)' with 1.10.4 (Ubuntu 18.04), worked fine with 1.8.2 (Ubuntu 16.10)
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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>Other
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<th>OS</th>
<td>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>mario.vukelic@dantian.org
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<pre>Created <span class=""><a href="attachment.cgi?id=139525" name="attach_139525" title="Output of sudo libinput-list-devices">attachment 139525</a> <a href="attachment.cgi?id=139525&action=edit" title="Output of sudo libinput-list-devices">[details]</a></span>
Output of sudo libinput-list-devices
Touchpad worked perfectly with libinput 1.8.2 on Ubuntu 17.10.
With 1.10.4 on Ubuntu 18.04, touchpad becomes temporarily unresponsive during
normal use.
The most reliable reproduction seems to perform a circular motion for a couple
of seconds. The pointer will stop moving and the touchpad will stop responding
to further input. Lifting the finger from the trackpad makes it work again
until problem is triggered next time (which usually only takes a few seconds
during use).
Running "sudo libinput debug-events --verbose" results in:
event6 POINTER_MOTION +11.04s 5.07/ -9.23
event6 POINTER_MOTION +11.05s 16.95/ -2.91
event6 POINTER_MOTION +11.06s 13.15/ -4.05
event6 - palm: touch size exceeded
event6 - palm: palm detected (touch size)
event6 - touch-size: end touch
event6 - button state: from BUTTON_STATE_AREA, event BUTTON_EVENT_UP to
BUTTON_STATE_NONE
Most likely the same issue was filed for Fedora and the apparent fix was to set
LIBINPUT_ATTR_PALM_SIZE_THRESHOLD=1000
See <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1575260">https://bugzilla.redhat.com/show_bug.cgi?id=1575260</a>
I also filed a bug in Ubuntu:
<a href="https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1764097">https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1764097</a></pre>
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