[Wayland-bugs] [Bug 99439] High cpu usage during trackpoint scrolling.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99439

            Bug ID: 99439
           Summary: High cpu usage during trackpoint scrolling.
           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: pinguin255 at gmail.com

When I use scrolling with trackpoint+3 mouse in Telegram (version 1.0)
messaging application with libinput driver, cpu goes as high as 70%-80% during
small movements. It only happens with trackpoint+3 mouse, but not with touchpad
while both use smooth scrolling.
To my understanding cpu usage for touchpad and trackpoint smooth scrolling
should be approximately the same for similar movements. So I suspect driver
issue. Also with evdev+synaptics driver cpu usage is also significantly less
(around 20%) for both devices. Only two of my applications use smooth scrolling
intensively: chromium and telegram, but I have problems only with telegram.

Distro: Ubuntu 16.04
DE: Xfce 4.12
Graphical server: Xorg 1.18
libinput 1.2.3
xserver-xorg-input-libinput 0.18.0

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