[Wayland-bugs] [Bug 103959] libinput 1.9.2 makes Thinkpad trackpoint too fast and user settings are ignored

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103959

--- Comment #3 from Lukas Waymann <meribold at gmail.com> ---
My TrackPoint also started to behave very differently after installing libinput
1.9.3.  I'm using a ThinkPad X121e running Arch Linux.  Using sysfs to change
the sensitivity worked.

Locate the files we can change (command from
<https://gist.github.com/noromanba/11261595>):

    $ find /sys/devices/platform/i8042 -name name | xargs grep -Fl TrackPoint |
sed 's/\/input\/input[0-9]*\/name$//'
    /sys/devices/platform/i8042/serio4/serio5

I checked whether the upgrade changed any values at this point, which it
didn't:

    # for f in /sys/devices/platform/i8042/serio4/serio5/*; do [[ -f $f ]] &&
echo "$f" && cat "$f"; done > new-values.txt
    # pacman -U /var/cache/pacman/pkg/libinput-1.8.3-1-x86_64.pkg.tar.xz  #
downgrade libinput
    # systemctl reboot
    # for f in /sys/devices/platform/i8042/serio4/serio5/*; do [[ -f $f ]] &&
echo "$f" && cat "$f"; done > old-values.txt
    $ diff -s new-values.txt old-values.txt
    Files old-values.txt and new-values.txt are identical

In the end I changed /sys/devices/platform/i8042/serio4/serio5/sensitivity to a
lower value:

    $ cat /sys/devices/platform/i8042/serio4/serio5/{speed,sensitivity}
    97
    128
    $ echo 100 | sudo tee /sys/devices/platform/i8042/serio4/serio5/sensitivity

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