[Wayland-bugs] [Bug 100436] Pointer jumps when using the rmi4 driver for precision touchpads

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100436

            Bug ID: 100436
           Summary: Pointer jumps when using the rmi4 driver for precision
                    touchpads
           Product: Wayland
           Version: 1.5.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: aduggan at synaptics.com

Created attachment 130512
  --> https://bugs.freedesktop.org/attachment.cgi?id=130512&action=edit
Noticeable jumps when drawing diagonal line

Versions 1.5 and higher seem to have introduced jumps in the pointer motion for
data being reported using the RMI4 driver. On example is when moving in a
descending diagonal line from right to left the pointer will jump down and then
back into position. It maybe that the new acceleration code is amplifying the
motion. Here is the link to the kernel mailing list discussing this issue.

https://marc.info/?l=linux-kernel&m=148998603125837&w=2

There is probably a kernel component which is contributing to this. But, since
the jumps are much more noticeable on newer versions of libinput I thought it
was worth looking into on the libinput side.

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