[Wayland-bugs] [Bug 106425] Touchpad jitter on Dell Latitude E7240 with 1.10.6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106425

            Bug ID: 106425
           Summary: Touchpad jitter on Dell Latitude E7240 with 1.10.6
           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: ckoresko at atlanticbb.net

Created attachment 139401
  --> https://bugs.freedesktop.org/attachment.cgi?id=139401&action=edit
Rather long capture made with 'sudo evemu-record'.  Multiple jitter events.

I'm seeing intermittent but frequent episodes of high jitter (mouse pointer
"flutters" at a high frequency between two roughly stable positions while the
finger is touching the pad but not moving).  The flutter is much fast than the
speed the real finger could achieve.  The flutter begins when the finger is
moved.  Once the flutter begins it tends to keep going until the finger has a
large motion or lifted.


$ udevadm info /sys/class/input/event5
  P: /devices/platform/i8042/serio1/input/input6/event5
  N: input/event5
  E: DEVNAME=/dev/input/event5
  E: DEVPATH=/devices/platform/i8042/serio1/input/input6/event5
  E: ID_BUS=i8042
  E: ID_INPUT=1
  E: ID_INPUT_HEIGHT_MM=43
  E: ID_INPUT_TOUCHPAD=1
  E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
  E: ID_INPUT_WIDTH_MM=95
  E: LIBINPUT_DEVICE_GROUP=11/2/8:isa0060/serio1
  E: LIBINPUT_MODEL_ALPS_TOUCHPAD=1
  E: LIBINPUT_MODEL_FIRMWARE_VERSION=310
  E: MAJOR=13
  E: MINOR=69
  E: SUBSYSTEM=input
  E: USEC_INITIALIZED=4278323


$ cat /sys/class/dmi/id/modalias
 
dmi:bvnDellInc.:bvrA25:bd02/01/2018:svnDellInc.:pnLatitudeE7240:pvr00:rvnDellInc.:rn0PRPKP:rvrA00:cvnDellInc.:ct9:cvr:


$ sudo /usr/libexec/libinput/libinput-measure-touchpad-pressure
/dev/input/event5
  Using AlpsPS/2 ALPS GlidePoint: /dev/input/event5
  Error: device does not have ABS_MT_PRESSURE


$ rpm -q libinput
libinput-1.10.6-1.fc28.x86_64

I don't seem to have touchpad-edge-detector on this OS (Fedora 28).

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