You have been subscribed to a public bug: 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 -- Unwanted touchpad movements on tap with Synaptics touchpad on DELL Inspiron-3521 https://bugs.launchpad.net/bugs/1808881 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to libinput in Ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
