[Wayland-bugs] [Bug 93165] libinput error: libinput bug: Event for missing capability CAP_POINTER on device "N-Trig MultiTouch"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93165

            Bug ID: 93165
           Summary: libinput error: libinput bug: Event for missing
                    capability CAP_POINTER on device "N-Trig MultiTouch"
           Product: Wayland
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: mail at baedert.org

I have a Thinkpad T410s, which has a touchscreen and a touchpad.
Whenever I press the touchscreen, I get journal messages like:
libinput error: libinput bug: Event for missing capability CAP_POINTER on
device "N-Trig MultiTouch"

This is reproducible and happens with every touch on the touchscreen. I get
other messages, however, and I'm not sure how to reliable trigger them, like:

  (1) libinput error: libinput bug: Unable to find topmost touch
  (2) libinput error: libinput bug: invalid tap event when fingers are up

(2) seems to *sometimes* happen when I press the touchpad with 2 fingers at
once, then lift one of the fingers, and (1) happens after that when I use only
one finger (but also just sometimes, I'm not sure if that's the exact way to
reproduce it).

libinput-list-devices prints:

Device:           Video Bus
Kernel:           /dev/input/event3
Group:            2
Seat:             seat0, default
Capabilities:     keyboard 
Tap-to-click:     n/a
Tap drag lock:    n/a
Left-handed:      n/a
Nat.scrolling:    n/a
Middle emulation: n/a
Calibration:      n/a
Scroll methods:   none
Click methods:    none
Disable-w-typing: n/a
Accel profiles:   n/a

Device:           N-Trig MultiTouch
Kernel:           /dev/input/event6
Group:            5
Seat:             seat0, default
Capabilities:     touch
Tap-to-click:     n/a
Tap drag lock:    n/a
Left-handed:      n/a
Nat.scrolling:    n/a
Middle emulation: n/a
Calibration:      identity matrix
Scroll methods:   none
Click methods:    none
Disable-w-typing: n/a
Accel profiles:   n/a

Device:           N-Trig Touchscreen
Kernel:           /dev/input/event7
Group:            5
Seat:             seat0, default
Size:             300.00x189.47mm
Capabilities:     touch
Tap-to-click:     n/a
Tap drag lock:    n/a
Left-handed:      n/a
Nat.scrolling:    n/a
Middle emulation: n/a
Calibration:      identity matrix
Scroll methods:   none
Click methods:    none
Disable-w-typing: n/a
Accel profiles:   n/a

Device:           SynPS/2 Synaptics TouchPad
Kernel:           /dev/input/event19
Group:            7
Seat:             seat0, default
Size:             58.88x32.50mm
Capabilities:     pointer 
Tap-to-click:     disabled
Tap drag lock:    disabled
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: n/a
Calibration:      n/a
Scroll methods:   *two-finger edge 
Click methods:    none
Disable-w-typing: enabled
Accel profiles:   none

Device:           TPPS/2 IBM TrackPoint
Kernel:           /dev/input/event20
Group:            8
Seat:             seat0, default
Capabilities:     pointer 
Tap-to-click:     n/a
Tap drag lock:    n/a
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: disabled
Calibration:      n/a
Scroll methods:   *button
Click methods:    none
Disable-w-typing: n/a
Accel profiles:   flat*adaptive

(I removed a few things I think are unimportant like the power button or the
integrated camera, just to make the report shorter).

I have libinput 1.1 installed and wayland 1.9 (which I can't select in bz for
some reason)

This is all using gnome-shell 3.18.3 which I also have in jhbuild, so if you
need more information or if I should test a patch, that's fine.

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