[ThinkPad T440s] Problem with touchpad after change for touchpad for T450s

[fuxo]

Hi guys,

i have NB Lenovo Thinkpad T440s. Is it great device, but has really bad touchpad (no hw buttons).
This touchpad can be replaced for touchpad for Thinkpad t450s (with 3 hw buttons).

It is "standard operation" and on the internet you can find lot of manuals and videos how replace it for touchpad for Thinkpad T450s.

Okay, and problem: After this replacement, new touchpad doing really "crazy" movemens and random clicks.

For illustration i attach videos with original and replaced touchpad.

Original touchpad: https://www.dropbox.com/s/wi0lh9l7gp...17.01.mp4?dl=0
Touchpad for T450s: https://www.dropbox.com/s/s1hzlc7f8b...32.04.mp4?dl=0

This problem is in my primary system and same behavior was beed after reboot to LiveCD.

Primary OS: Xubuntu 17.10
Live for test: Xubuntu 18.04

Have you idea, whether is HW or driver problem?
Thanks for any answers.

Lukas

[tinylagarto]

Did you try to change something from the Xfce mouse settings?

Then you tried it live and on a development release. The question would be how well it would perform on 17.10?

[fuxo]

Hi ivanovnegro2,

no, i use only defaut settings (original touchpad works good with default settings (and on LiveCD too)).

Have you idea which settings can i try to change?
On which version of Ubuntu can try new touchpad, in your opinion?

Thank you.

[cruzer001]

There are two packages (drivers) for touchpads. Which one are you using?

apt policy *synaptics libinput*

How is your touchpad listed?

xinput list

Both have settings that can be tweaked for your touchpad. Depending on which one your running; Google can provide you with a ton of suggestions (as it did for my Dell).

Also got some hits here:

https://www.google.com/search?client...utf-8&oe=utf-8

[fuxo]

Hi guys,

today aj saw absolutly unbelievable thing:

After 3. replacement of original and new touchpad i tried start notebook and touchpad unexpectable works... Without changes drivers, without any settings... I tried only start notebook and always works fine.
I absolute don't know where was a problem - maybe wrong contact on cables, maybe permanently pushed button (both very, very unlikely) but now, always works great.

Thank you for your time.

Lukas.

[alex-slab]

Hi Fuxo,

I'm getting the same issue - jumpy cursor, random clicks - after replacing my trackpad. I actually bought a second new trackpad and cable but still the behaviour is the same. I just wondered whether you had any more insights about what was wrong with yours, and why it started working?