[Wayland-bugs] [Bug 94601] unexpected scroll event 0 in area state

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94601

            Bug ID: 94601
           Summary: unexpected scroll event 0 in area state
           Product: Wayland
           Version: 1.2.x
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: marco at crepererum.net

Created attachment 122389
  --> https://bugs.freedesktop.org/attachment.cgi?id=122389&action=edit
evemu record

Description:
Sometimes the touch pad "tab" function stops working. See "steps to reproduce"
for more details. The problem was introduced recently (before the system worked
totally fine for over 6 months)


Additional info:
* libinput 1.2.2
* xf86-input-libinput 0.17.0
* system is a Lenovo Carbon X1, 2015 edition (3rd gen)
* touchpad dimensions: 100mm w X 55mm h
* kernel is 4.4.5.201603142220-1-grsec (Arch Linux)


evemu recording:
see attachement, the bug happens somewhere at the end, than I used the
"scroll-around" work-around and got a tab-driven click working (see "Steps to
reproduce" section)


/sys/class/dmi/id/modalias:
dmi:bvnLENOVO:bvrN14ET31W(1.09):bd06/26/2015:svnLENOVO:pn20BTS2EJ00:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BTS2EJ00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:


xinput list-props:
Device 'SynPS/2 Synaptics TouchPad':
        Device Enabled (138):   1
        Coordinate Transformation Matrix (140): 1.000000, 0.000000, 0.000000,
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        libinput Tapping Enabled (277): 1
        libinput Tapping Enabled Default (278): 0
        libinput Tapping Drag Enabled (279):    1
        libinput Tapping Drag Enabled Default (280):    1
        libinput Tapping Drag Lock Enabled (281):       0
        libinput Tapping Drag Lock Enabled Default (282):       0
        libinput Accel Speed (283):     0.488789
        libinput Accel Speed Default (284):     0.000000
        libinput Natural Scrolling Enabled (285):       1
        libinput Natural Scrolling Enabled Default (286):       0
        libinput Send Events Modes Available (261):     1, 1
        libinput Send Events Mode Enabled (262):        0, 0
        libinput Send Events Mode Enabled Default (263):        0, 0
        libinput Left Handed Enabled (287):     0
        libinput Left Handed Enabled Default (288):     0
        libinput Scroll Methods Available (289):        1, 1, 0
        libinput Scroll Method Enabled (290):   1, 0, 0
        libinput Scroll Method Enabled Default (291):   1, 0, 0
        libinput Click Methods Available (292): 1, 1
        libinput Click Method Enabled (293):    1, 0
        libinput Click Method Enabled Default (294):    1, 0
        libinput Disable While Typing Enabled (295):    1
        libinput Disable While Typing Enabled Default (296):    1
        Device Node (264):      "/dev/input/event10"
        Device Product ID (265):        2, 7
        libinput Drag Lock Buttons (297):       <no items>
        libinput Horizonal Scroll Enabled (266):        1





Kernel synaptics boot log:
psmouse serio1: synaptics: queried max coordinates: x [..5676], y [..4758]
psmouse serio1: synaptics: queried min coordinates: x [1266..], y [1096..]
psmouse serio1: synaptics: Touchpad model: 1, fw: 8.1, id: 0x1e2b1, caps:
0xf003a3/0x943300/0x12e800/0x10000, board id: 3072, fw id: 1795685
psmouse serio1: synaptics: serio: Synaptics pass-through port at
isa0060/serio1/input0



Steps to reproduce:
Work with the touchpad (tab and scroll around), after a while, the tab feature
isn't working anymore, but scrolling and mouse movement seems to behave as
expected. The logs show the following information
/usr/lib/gdm/gdm-x-session[XXXX]: (EE) libinput bug: unexpected scroll event 0
in area state

The tab feature can be restored using one of the following work-arounds:
* go to the GNOME system settings and disable and re-enable the tab settings
* try to "scroll" using 3 fingers, after some tries the libinput seems to
behave normally again

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