[Wayland-bugs] [Bug 106648] libinput trackpoint scrolling is too slow and ignores LIBINPUT_ATTR_TRACKPOINT_RANGE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106648

            Bug ID: 106648
           Summary: libinput trackpoint scrolling is too slow and ignores
                    LIBINPUT_ATTR_TRACKPOINT_RANGE
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: hyperair at gmail.com

Created attachment 139757
  --> https://bugs.freedesktop.org/attachment.cgi?id=139757&action=edit
Patch to use accelerated deltas for scrolling

This is a followup from
https://bugs.freedesktop.org/show_bug.cgi?id=106506#c12:

Scrolling on my trackpoint (Lite-On Technology Corp. Thinkpad USB Keyboard with
TrackPoint, with usb-id: 17ef:6009) is too slow and does not take
LIBINPUT_ATTR_TRACKPOINT_RANGE into consideration, leading to a jarring
mismatch in scrolling vs movement speed.

A solution I've found to have worked for me in Chrome Beta and Evince is to use
accelerated deltas for scrolling.

Here are the versions of the packages I'm using in Ubuntu.

google-chrome-beta:
  Installed: 67.0.3396.48-1
  Candidate: 67.0.3396.48-1
  Version table:
 *** 67.0.3396.48-1 500
        500 http://dl.google.com/linux/chrome/deb stable/main amd64 Packages
        100 /var/lib/dpkg/status
libgtk-3-0:
  Installed: 3.22.30-1ubuntu1
  Candidate: 3.22.30-1ubuntu1
  Version table:
 *** 3.22.30-1ubuntu1 500
        500 http://sg.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status
evince:
  Installed: 3.28.2-1
  Candidate: 3.28.2-1
  Version table:
 *** 3.28.2-1 500
        500 http://sg.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

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