[Wayland-bugs] [Bug 96848] Slow and fast movements on T450s touchpad are unpredictable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96848

            Bug ID: 96848
           Summary: Slow and fast movements on T450s touchpad are
                    unpredictable
           Product: Wayland
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: talcite at gmail.com

Created attachment 124945
  --> https://bugs.freedesktop.org/attachment.cgi?id=124945&action=edit
slow movement accelerating

Hi, 

I've been comparing the acceleration with the synaptics driver and with the new
libinput driver. The small movements are really causing me a lot of pain.

It seems like the slow movements are too fast/unpredictable and the fast ones
are too slow. Under the synaptics profile, the slow movements seem to have no
acceleration (the touchpad is mapped to the screen area?) and the fast
movements have higher acceleration. But in libinput, it's the opposite. The
slow movements accelerate too much, and the fast ones don't accelerate enough.
When I make small adjustments on the screen, I often overshoot the target, and
even when making quick swipes, I still need several to get across the screen
(as opposed to one or two in synaptics).

Is this a case of being nitpicky?

I've included the evemu log, although I doubt it helps. It just shows an
example of accelerating under slow movement.

Thanks!

Libinput version 
==========
1.3.3-2.fc24

libinput settings
==========
$ xinput list-props "SynPS/2 Synaptics TouchPad"
Device 'SynPS/2 Synaptics TouchPad':
        Device Enabled (136):   1
        Coordinate Transformation Matrix (138): 1.000000, 0.000000, 0.000000,
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        libinput Tapping Enabled (272): 1
        libinput Tapping Enabled Default (273): 0
        libinput Tapping Drag Enabled (274):    1
        libinput Tapping Drag Enabled Default (275):    1
        libinput Tapping Drag Lock Enabled (276):       0
        libinput Tapping Drag Lock Enabled Default (277):       0
        libinput Accel Speed (278):     -0.448529
        libinput Accel Speed Default (279):     0.000000
        libinput Natural Scrolling Enabled (280):       1
        libinput Natural Scrolling Enabled Default (281):       0
        libinput Send Events Modes Available (256):     1, 1
        libinput Send Events Mode Enabled (257):        0, 0
        libinput Send Events Mode Enabled Default (258):        0, 0
        libinput Left Handed Enabled (282):     0
        libinput Left Handed Enabled Default (283):     0
        libinput Scroll Methods Available (284):        1, 1, 0
        libinput Scroll Method Enabled (285):   1, 0, 0
        libinput Scroll Method Enabled Default (286):   1, 0, 0
        libinput Click Methods Available (287): 1, 1
        libinput Click Method Enabled (288):    1, 0
        libinput Click Method Enabled Default (289):    1, 0
        libinput Disable While Typing Enabled (290):    1
        libinput Disable While Typing Enabled Default (291):    1
        Device Node (259):      "/dev/input/event4"
        Device Product ID (260):        2, 7
        libinput Drag Lock Buttons (292):       <no items>
        libinput Horizonal Scroll Enabled (261):        1

Hardware
==========
Lenovo Thinkpad T450s

$ cat /sys/class/dmi/id/modalias 
dmi:bvnLENOVO:bvrJBET46WW(1.11):bd03/02/2015:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNone:

Physical Dimensions
==========
100mm x 56mm (h x v)

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