[Wayland-bugs] [Bug 93846] scrolling jump and movement threshold

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93846

            Bug ID: 93846
           Summary: scrolling jump and movement threshold
           Product: Wayland
           Version: 1.4.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: glncst at live.it

Created attachment 121258
  --> https://bugs.freedesktop.org/attachment.cgi?id=121258&action=edit
evemu-record

Hi,

I have some issues with my touchpad with libinput driver (no problem is present
wyth synaptics driver). I'm running archlinux and gnome on wayland.

hardware info in evemu-record attached file

First problem: small movement are ineffective on the mouse cursor (i.e. no
movement at all). or there are but really not smooth. That makes things hard
when making fine positioning.

Second problem: Scrolling also requires a huge stroke to be activated (I think
this may be due to the first problem to fail to recognize small movements).
Moreover, and this is what has the greatest impact on usability, there are many
jumps in scrolling mode.

I tried to simulate both problems during the recording of the event. But in my
opinion the problem is present elsewhere because movements are recognized
correctly by the kernel.

I don't know if it might be useful but here's the output of udevadm test:

---------------------------------
.INPUT_CLASS=mouse
ACTION=add
DEVLINKS=/dev/input/by-path/platform-i8042-serio-4-event-mouse
DEVNAME=/dev/input/event14
DEVPATH=/devices/platform/i8042/serio4/input/input15/event14
ID_INPUT=1
ID_INPUT_TOUCHPAD=1
ID_PATH=platform-i8042-serio-4
ID_PATH_TAG=platform-i8042-serio-4
ID_SERIAL=noserial
LIBINPUT_ATTR_RESOLUTION_HINT=31x31
LIBINPUT_DEVICE_GROUP=11/2/e/0:isa0060/serio4
LIBINPUT_MODEL_ELANTECH_TOUCHPAD=1
MAJOR=13
MINOR=78
SUBSYSTEM=input
USEC_INITIALIZED=15972787
---------------------------------

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