[Wayland-bugs] [Bug 106489] '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)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106489

            Bug ID: 106489
           Summary: '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)
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: mario.vukelic at dantian.org

Created attachment 139525
  --> https://bugs.freedesktop.org/attachment.cgi?id=139525&action=edit
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 https://bugzilla.redhat.com/show_bug.cgi?id=1575260

I also filed a bug in Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1764097

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