[Wayland-bugs] [Bug 95437] Choppy response on Elantech trackpads with libinput 1.3.0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95437

            Bug ID: 95437
           Summary: Choppy response on Elantech trackpads with libinput
                    1.3.0
           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: plisandro at gmail.com

Created attachment 123803
  --> https://bugs.freedesktop.org/attachment.cgi?id=123803&action=edit
evemu-record ouput for  simple right-to-left pointer movement.

After an upgrade to libinput 1.3.0 my Elantech trackpad (on an Asus UX305C)
became very unresponsive and inaccurate - it takes serveral tries to get the
pointer moving, as if it became "sticky" somehow. Reverting libinput to 1.2.4
fixes this issue and the trackpad works fluidly without any issues whatsoever.

OS: Arch Linux x64
Libinput version: 1.3.0
/sys/class/dmi/id/modalias:
dmi:bvnAmericanMegatrendsInc.:bvrUX305CA.201:bd09/11/2015:svnASUSTeKCOMPUTERINC.:pnUX305CA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX305CA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:

libinput-list-devices:
...
Device:           Elan Touchpad
Kernel:           /dev/input/event8
Group:            6
Seat:             seat0, default
Size:             96.78x64.21mm
Capabilities:     pointer 
Tap-to-click:     disabled
Tap-and-drag:     enabled
Tap drag lock:    disabled
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: n/a
Calibration:      n/a
Scroll methods:   *two-finger edge 
Click methods:    *button-areas clickfinger 
Disable-w-typing: enabled
Accel profiles:   none
...

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