Public bug reported:

When using the touchpad, the mouse cursor moves even when keeping the
finger still on one point.

Triggering the behaviour: this happens when the contact surface is very
small, so it gets triggered for example when tapping on a button, right
before the finger leaves the touchpad. This makes clicking buttons using
the touchpad (for example, the "x" button in the browser tabs) very
difficult.

In attachment, an evemu-record done keeping the finger on one point,
barely touching the touchpad.

The recording was done with the command:

sudo evemu-record > touchpad.evemu
Available devices:
/dev/input/event0:      Power Button
/dev/input/event1:      Lid Switch
/dev/input/event2:      Power Button
/dev/input/event3:      AT Translated Set 2 keyboard
/dev/input/event4:      Video Bus
/dev/input/event8:      SynPS/2 Synaptics TouchPad
/dev/input/event9:      Dell WMI hotkeys
/dev/input/event10:     HDA Intel PCH Mic
/dev/input/event11:     HDA Intel PCH Front Headphone
/dev/input/event12:     HDA Intel PCH HDMI/DP,pcm=3
/dev/input/event13:     Laptop_Integrated_Webcam_HD: In
Select the device event number [0-13]: 8

To replay the recording (the strange behaviour is particularly visible
in the final part):

sudo evemu-play  /dev/input/event8 < touchpad.evemu

(replace event8 with your input device)

System info:

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic

apt-cache policy libinput10
libinput10:
  Installato: 1.10.4-1
  Candidato:  1.10.4-1
  Tabella versione:
 *** 1.10.4-1 500
        500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

apt-cache policy libinput-bin
libinput-bin:
  Installato: 1.10.4-1
  Candidato:  1.10.4-1
  Tabella versione:
 *** 1.10.4-1 500
        500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: libinput (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "evemu-record track when keeping the finger still on one 
point"
   
https://bugs.launchpad.net/bugs/1808881/+attachment/5223096/+files/touchpad.evemu

** Description changed:

  When using the touchpad, the mouse cursor moves even when keeping the
  finger still on one point.
  
  Triggering the behaviour: this happens when the contact surface is very
  small, so it gets triggered for example when tapping on a button, right
  before the finger leaves the touchpad. This makes clicking buttons using
  the touchpad (for example, the "x" button in the browser tabs) very
  difficult.
  
  In attachment, an evemu-record done keeping the finger on one point,
  barely touching the touchpad.
  
  The recording was done with the command:
  
  sudo evemu-record > touchpad.evemu
  Available devices:
  /dev/input/event0:    Power Button
  /dev/input/event1:    Lid Switch
  /dev/input/event2:    Power Button
  /dev/input/event3:    AT Translated Set 2 keyboard
  /dev/input/event4:    Video Bus
  /dev/input/event8:    SynPS/2 Synaptics TouchPad
  /dev/input/event9:    Dell WMI hotkeys
  /dev/input/event10:   HDA Intel PCH Mic
  /dev/input/event11:   HDA Intel PCH Front Headphone
  /dev/input/event12:   HDA Intel PCH HDMI/DP,pcm=3
  /dev/input/event13:   Laptop_Integrated_Webcam_HD: In
  Select the device event number [0-13]: 8
  
  To replay the recording:
  
  sudo evemu-play  /dev/input/event8 < touchpad.evemu
  
  (replace event8 with your input device)
+ 
+ System info:
+ 
+ lsb_release -a
+ No LSB modules are available.
+ Distributor ID:       Ubuntu
+ Description:  Ubuntu 18.04.1 LTS
+ Release:      18.04
+ Codename:     bionic
+ 
+ apt-cache policy libinput10 
+ libinput10:
+   Installato: 1.10.4-1
+   Candidato:  1.10.4-1
+   Tabella versione:
+  *** 1.10.4-1 500
+         500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
+         100 /var/lib/dpkg/status
+ 
+ apt-cache policy libinput-bin 
+ libinput-bin:
+   Installato: 1.10.4-1
+   Candidato:  1.10.4-1
+   Tabella versione:
+  *** 1.10.4-1 500
+         500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
+         100 /var/lib/dpkg/status

** Description changed:

  When using the touchpad, the mouse cursor moves even when keeping the
  finger still on one point.
  
  Triggering the behaviour: this happens when the contact surface is very
  small, so it gets triggered for example when tapping on a button, right
  before the finger leaves the touchpad. This makes clicking buttons using
  the touchpad (for example, the "x" button in the browser tabs) very
  difficult.
  
  In attachment, an evemu-record done keeping the finger on one point,
  barely touching the touchpad.
  
  The recording was done with the command:
  
  sudo evemu-record > touchpad.evemu
  Available devices:
  /dev/input/event0:    Power Button
  /dev/input/event1:    Lid Switch
  /dev/input/event2:    Power Button
  /dev/input/event3:    AT Translated Set 2 keyboard
  /dev/input/event4:    Video Bus
  /dev/input/event8:    SynPS/2 Synaptics TouchPad
  /dev/input/event9:    Dell WMI hotkeys
  /dev/input/event10:   HDA Intel PCH Mic
  /dev/input/event11:   HDA Intel PCH Front Headphone
  /dev/input/event12:   HDA Intel PCH HDMI/DP,pcm=3
  /dev/input/event13:   Laptop_Integrated_Webcam_HD: In
  Select the device event number [0-13]: 8
  
- To replay the recording:
+ To replay the recording (the strange behaviour is particularly visible
+ in the final part):
  
  sudo evemu-play  /dev/input/event8 < touchpad.evemu
  
  (replace event8 with your input device)
  
  System info:
  
  lsb_release -a
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu 18.04.1 LTS
  Release:      18.04
  Codename:     bionic
  
- apt-cache policy libinput10 
+ apt-cache policy libinput10
  libinput10:
-   Installato: 1.10.4-1
-   Candidato:  1.10.4-1
-   Tabella versione:
-  *** 1.10.4-1 500
-         500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
-         100 /var/lib/dpkg/status
+   Installato: 1.10.4-1
+   Candidato:  1.10.4-1
+   Tabella versione:
+  *** 1.10.4-1 500
+         500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
+         100 /var/lib/dpkg/status
  
- apt-cache policy libinput-bin 
+ apt-cache policy libinput-bin
  libinput-bin:
-   Installato: 1.10.4-1
-   Candidato:  1.10.4-1
-   Tabella versione:
-  *** 1.10.4-1 500
-         500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
-         100 /var/lib/dpkg/status
+   Installato: 1.10.4-1
+   Candidato:  1.10.4-1
+   Tabella versione:
+  *** 1.10.4-1 500
+         500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
+         100 /var/lib/dpkg/status

** Package changed: gdm3 (Ubuntu) => libinput (Ubuntu)

-- 
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Desktop Bugs, which is subscribed to gdm3 in Ubuntu.
https://bugs.launchpad.net/bugs/1808881

Title:
  Unwanted touchpad movements on tap with Synaptics touchpad on DELL
  Inspiron-3521

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