Lenovo T480 jumpy trackpoint with 16.04

Question

I have installed Ubuntu 16.04 desktop version on my T480. I'm generally happy with the performance and nice keyboard but trackpoint is quite jumpy and wiggles a little when I'm bringing track point to desired place.

This happened when I installed Ubuntu 16.04 on T470P in the past. I wonder this is hardware issue or driver issue and can be fixed.

https://certification.ubuntu.com/hardware/201801-26058/ https://certification.ubuntu.com/hardware/201605-22282/

When I see mouse driver for T460
Aquantia Corp. TPPS/2 IBM TrackPoint is used and I wonder this has something to do with the issue.

Some digging around got me to this setting but "accel-profile" not present in my T480

gsettings set org.gnome.desktop.peripherals.mouse accel-profile 'adaptive'

I wonder if there are any other users experiencing this.

Thanks

Takeshi

user4157482 · Answer 1 · 2018-06-28T13:05:23.363

I think this is not a problem specific to Ubuntu. I had the same issue on my T480 running Manjaro / Cinnamon. Libinput version is 1.11.0-1.

I represent my solution here. It should be applicable to Ubuntu as well with minor modifications.

Disable trackpoint acceleration:

Write new Xorg configuration file (i.e. /etc/X11/xorg.conf.d/11-trackpoint.conf):

Section "InputClass"
    Identifier "Trackpoint"
        MatchProduct "TPPS/2 IBM TrackPoint"
        Driver "libinput"
        Option "Accel Speed" "0"
        Option "Accel Profile" "flat"
EndSection

Calibrate trackpoint range:

Write new hwdb adjustment file (i.e. /etc/udev/hwdb.d/99-trackpoint.hwdb):

evdev:name:TPPS/2 IBM TrackPoint*
    LIBINPUT_ATTR_TRACKPOINT_RANGE=50

Restart computer

Adjust sensitivity/speed:

echo 97 > /sys/devices/platform/i8042/serio1/serio2/speed
echo 255 > /sys/devices/platform/i8042/serio1/serio2/sensitivity

Lenovo T480 jumpy trackpoint with 16.04

1 Answers1