https://bugs.freedesktop.org/show_bug.cgi?id=102116

            Bug ID: 102116
           Summary: AlpsPS/2 ALPS DualPoint TouchPad: (EE) kernel bug:
                    Touch jump detected and discarded.
           Product: Wayland
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs@lists.freedesktop.org
          Reporter: pj.crom...@gmail.com

Created attachment 133378
  --> https://bugs.freedesktop.org/attachment.cgi?id=133378&action=edit
events from AlpsPS/2 ALPS DualPoint TouchPad and evemu record.

Model: Dell Latitude E5550
Version: libinput 1.6.3

How to reproduce: Pinch with your thumb and three fingertips like if you want
to activate Mac's "Launchpad" feature.

Device:           AlpsPS/2 ALPS DualPoint TouchPad
Kernel:           /dev/input/event17
Group:            7
Seat:             seat0, default
Size:             102.38x53.87mm
Capabilities:     pointer 
Tap-to-click:     disabled
Tap-and-drag:     enabled
Tap drag lock:    disabled
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: enabled
Calibration:      n/a
Scroll methods:   *two-finger edge 
Click methods:    none
Disable-w-typing: enabled
Accel profiles:   none
Rotation:         n/a

$ xinput list-props "AlpsPS/2 ALPS DualPoint TouchPad"
Device 'AlpsPS/2 ALPS DualPoint TouchPad':
        Device Enabled (140):   1
        Coordinate Transformation Matrix (142): 1.000000, 0.000000, 0.000000,
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        libinput Tapping Enabled (322): 0
        libinput Tapping Enabled Default (323): 0
        libinput Tapping Drag Enabled (324):    1
        libinput Tapping Drag Enabled Default (325):    1
        libinput Tapping Drag Lock Enabled (326):       0
        libinput Tapping Drag Lock Enabled Default (327):       0
        libinput Tapping Button Mapping Enabled (328):  1, 0
        libinput Tapping Button Mapping Default (329):  1, 0
        libinput Accel Speed (304):     0.000000
        libinput Accel Speed Default (305):     0.000000
        libinput Natural Scrolling Enabled (309):       0
        libinput Natural Scrolling Enabled Default (310):       0
        libinput Send Events Modes Available (289):     1, 1
        libinput Send Events Mode Enabled (290):        0, 0
        libinput Send Events Mode Enabled Default (291):        0, 0
        libinput Left Handed Enabled (311):     0
        libinput Left Handed Enabled Default (312):     0
        libinput Scroll Methods Available (313):        1, 1, 0
        libinput Scroll Method Enabled (314):   1, 0, 0
        libinput Scroll Method Enabled Default (315):   1, 0, 0
        libinput Middle Emulation Enabled (318):        1
        libinput Middle Emulation Enabled Default (319):        1
        libinput Disable While Typing Enabled (330):    1
        libinput Disable While Typing Enabled Default (331):    1
        Device Node (292):      "/dev/input/event17"
        Device Product ID (293):        2, 8
        libinput Drag Lock Buttons (320):       <no items>
        libinput Horizontal Scroll Enabled (321):       1

$ udevadm info /sys/class/input/event17

P: /devices/platform/i8042/serio1/input/input8/event17
N: input/event17
E: DEVNAME=/dev/input/event17
E: DEVPATH=/devices/platform/i8042/serio1/input/input8/event17
E: ID_BUS=i8042
E: ID_INPUT=1
E: ID_INPUT_HEIGHT_MM=53
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: ID_INPUT_WIDTH_MM=102
E: LIBINPUT_DEVICE_GROUP=11/2/8/700:isa0060/serio1
E: LIBINPUT_MODEL_ALPS_TOUCHPAD=1
E: LIBINPUT_MODEL_FIRMWARE_VERSION=700
E: MAJOR=13
E: MINOR=81
E: SUBSYSTEM=input
E: USEC_INITIALIZED=29108658

$ cat /sys/class/dmi/id/modalias

dmi:bvnDellInc.:bvrA15:bd05/09/2017:svnDellInc.:pnLatitudeE5550:pvr:rvnDellInc.:rn0JPRM5:rvrA00:cvnDellInc.:ct9:cvr:

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