[Wayland-bugs] [Bug 105535] SynPS/2 Synaptics TouchPad detects fingers not touching the touchpad while using two-finger scrolling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105535

            Bug ID: 105535
           Summary: SynPS/2 Synaptics TouchPad detects fingers not
                    touching the touchpad while using two-finger 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: sergei.jakovlev.10 at gmail.com

Synaptics touchpad is way too sensitive when using libinput during two finger
scrolling - it detects fingers not touching the touchpad at all (2-3 mm away
from the surface). The behavior of the cursor itself when not scrolling seems
OK (it does not move when a finger is not touching the surface). The speed of
scrolling and cursor movement is also OK.

As per
https://wayland.freedesktop.org/libinput/doc/latest/touchpad_pressure.html I
tried to run "libinput measure touchpad-pressure", but it fails on my machine:

# libinput measure touchpad-pressure
Using SynPS/2 Synaptics TouchPad: /dev/input/event8

Error: device does not have ABS_MT_PRESSURE

I would like to ask for advice how to proceed. As far as I understand, there is
no user configurable sensitivity in libinput, and normal recommendation is to
use pressure measurement tool and file a bug report, but the tool fails on my
machine.

Other information required by bug reporting guidelines:

$ pacman -Ss libinput
extra/libinput 1.10.3-1 [installed]
    Input device management and event handling library
extra/xf86-input-libinput 0.26.0-1 (xorg-drivers) [installed]
    Generic input driver for the X.Org server based on libinput

$ xinput list-props "SynPS/2 Synaptics TouchPad"
Device 'SynPS/2 Synaptics TouchPad':
        Device Enabled (140):   1
        Coordinate Transformation Matrix (142): 1.000000, 0.000000, 0.000000,
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        libinput Tapping Enabled (275): 1
        libinput Tapping Enabled Default (276): 0
        libinput Tapping Drag Enabled (277):    1
        libinput Tapping Drag Enabled Default (278):    1
        libinput Tapping Drag Lock Enabled (279):       0
        libinput Tapping Drag Lock Enabled Default (280):       0
        libinput Tapping Button Mapping Enabled (281):  1, 0
        libinput Tapping Button Mapping Default (282):  1, 0
        libinput Natural Scrolling Enabled (283):       0
        libinput Natural Scrolling Enabled Default (284):       0
        libinput Left Handed Enabled (285):     0
        libinput Left Handed Enabled Default (286):     0
        libinput Accel Speed (287):     0.000000
        libinput Accel Speed Default (288):     0.000000
        libinput Scroll Methods Available (289):        1, 1, 0
        libinput Scroll Method En<code>abled (290):     1, 0, 0
        libinput Scroll Method Enabled Default (291):   1, 0, 0
        libinput Send Events Modes Available (260):     1, 1
        libinput Send Events Mode Enabled (261):        0, 0
        libinput Send Events Mode Enabled Default (262):        0, 0
        libinput Disable While Typing Enabled (292):    1
        libinput Disable While Typing Enabled Default (293):    1
        Device Node (263):      "/dev/input/event8"
        Device Product ID (264):        2, 7
        libinput Drag Lock Buttons (294):       <no items>
        libinput Horizontal Scroll Enabled (295):       1

Laptop: HP ProBook 4530s

$ cat /sys/class/dmi/id/modalias
dmi:bvnHewlett-Packard:bvr68SRRVer.F.63:bd04/06/2017:svnHewlett-Packard:pnHPProBook4530s:pvrA0000C02:rvnHewlett-Packard:rn167C:rvrKBCVersion22.26:cvnHewlett-Packard:ct10:cvr:

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