[Wayland-bugs] [Bug 98557] Two-finger scrolling: delay between finger movement and actual scrolling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98557

            Bug ID: 98557
           Summary: Two-finger scrolling: delay between finger movement
                    and actual scrolling
           Product: Wayland
           Version: 1.5.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: easymodofrf at gmail.com

Created attachment 127705
  --> https://bugs.freedesktop.org/attachment.cgi?id=127705&action=edit
two-finger scroll up

There is a very noticeable delay between start of two-finger movement and an
actual scroll event. This doesn't happen on X11 with synaptics driver.
I'm using Lenovo Thinkpad T440 (OS: Arch, Gnome/Wayland, libinput version:
1.5.0-1).
Attachment is evemu recording in which i place two fingers and move up.

###### udevadm info /sys/class/input/event13 ######

P: /devices/platform/i8042/serio1/input/input13/event13
N: input/event13
E: DEVNAME=/dev/input/event13
E: DEVPATH=/devices/platform/i8042/serio1/input/input13/event13
E: ID_BUS=i8042
E: ID_INPUT=1
E: ID_INPUT_HEIGHT_MM=66
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: ID_INPUT_WIDTH_MM=97
E: LIBINPUT_DEVICE_GROUP=11/2/7/1b1:isa0060/serio1
E: LIBINPUT_MODEL_SYNAPTICS_SERIAL_TOUCHPAD=1
E: MAJOR=13
E: MINOR=77
E: SUBSYSTEM=input
E: USEC_INITIALIZED=2378449


##### cat /sys/class/dmi/id/modalias #####

dmi:bvnLENOVO:bvrGJET84WW(2.34):bd06/22/2015:svnLENOVO:pn20B6005JUS:pvrThinkPadT440:rvnLENOVO:rn20B6005JUS:rvr0B98401PRO:cvnLENOVO:ct10:cvrNotAvailable:


##### physical touchpad dimensions #####

100x70 mm

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