author:

---
author:
email: [email protected]
image: https://petermolnar.net/favicon.jpg
name: Peter Molnar
url: https://petermolnar.net
copies:
- http://web.archive.org/web/20170708205715/https://petermolnar.net/trackpoint-drifting-stop/
lang: en
published: '2017-05-31T18:00:00+00:00'
summary: How to stop Trackpoint from constantly, slowly moving on it's own under linux
tags:
- linux desktop
title: A dirty fix for non-stop drifting Trackpoint

---

## The problem

> \[...\] **PROBLEM**: The cursor always slowly moves to the lower left.
> One pixel every few seconds[^1].\[...\]

I had the exact same issue[^2]: painfully slowly drifting Trackpoint on
my X250, never stopping. I'm aware of the Trackpoint self-calibration, I
had that on the X200, on the T400, and on the T500, but this was
different. **If you have the pointer moving fast or just rarely on it's
own, that is normal.** In my case, it never stopped.

The really surprising thing was that this only happened under Debian
Stretch (RC2) and not under Ubuntu 16.04, so I started looking around
`/sys`:

*Note: it's probably serio2, but could be 3, 4, etc., depending on
module load order and number of input devices.*

``` {.bash}
# ls /sys/devices/platform/i8042/serio1/serio3
bind_mode driver id mindrag protocol resolution speed upthresh
description drvctl inertia modalias rate resync_time subsystem ztime
draghys ext_dev input power reach sensitivity thresh
drift_time firmware_id jenks press_to_select resetafter skipback uevent
```

Most of these are pretty much undocumented and so far none of the GUI
configuration managers supported them. The 3 interesting ones are
`drift_time`, `sensitivity`, and `speed` in this case.

**Despite this fix, this is most probably a hardware problem, so
consider replacing the keyboard, especially if it's still under
warranty, though if it doesn't happen under Windows, this will be near
impossible to get through the service.**

## Temporary fix

Most will recommend to lower the sensitivity, but that doesn't always
work or help.

``` {.bash}
echo 2 > /sys/devices/platform/i8042/serio1/serio2/drift_time
echo 180 > /sys/devices/platform/i8042/serio1/serio2/sensitivity
echo 50 > /sys/devices/platform/i8042/serio1/serio2/speed
```

## Keep it after reboot

``` {.bash}
systemd-tmpfiles --prefix=/sys --create
sensible-editor /etc/tmpfiles.d/trackpoint.conf
```

w /sys/devices/platform/i8042/serio1/serio2/speed - - - - 50
w /sys/devices/platform/i8042/serio1/serio2/sensitivity - - - - 180
w /sys/devices/platform/i8042/serio1/serio2/drift_time - - - - 2

\`\`\`

## UPDATE (2019-02-14 20:12)

The path has changed:

w /sys/devices/rmi4-00/rmi4-00.fn03/serio3/speed - - - - 180
w /sys/devices/rmi4-00/rmi4-00.fn03/serio3/sensitivity - - - - 120
w /sys/devices/rmi4-00/rmi4-00.fn03/serio3/drift_time - - - - 2

[^1]: <https://superuser.com/questions/1200352/thinkpad-trackpoint-moves-on-its-own-on-linux>

[^2]: <https://www.reddit.com/r/thinkpad/comments/68sxua/x250_trackpoint_acting_up_on_debian_up_to_date/>