Touchpad lag on DELL Latitude 7490
Summary
I have a new DELL Latitude 7490 with Ubuntu 18.04.1 and I am experiencing a little annoying bug related to the touchpad. When I don't use it for some time (more than 3~4 seconds), if then I sweep quickly my finger on it, the cursor gest "teleported" to his final position, without actually showing the path. It feels like the touchpad goes to a sort of "sleep mode", and then when it wakes up there is a small, but perceptible, lag that makes this jump of the cursor to happen. If I use the touchpad continuosly this does not happen, but only after some seconds of inactivity. The same behavior happens with the trackpad (the "nipple").
I tried updating the Linux kernel to last mainline version and changing all the possible libinput options, with no success.
Steps to reproduce
On a DELL Latitude 7490 with Ubuntu 18.04.1, sweep quickly the finger on the touchpad, after some seconds of inactivity.
libinput version you encountered the bug on
Package: libinput10
Status: install ok installed
Priority: optional
Section: libs
Installed-Size: 267
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Architecture: amd64
Multi-Arch: same
Source: libinput
Version: 1.10.4-1
Depends: libc6 (>= 2.9), libevdev2 (>= 1.3), libmtdev1 (>= 1.1.0), libudev1 (>= 183), libwacom2 (>= 0.20), libinput-bin (>= 1.10.4-1)
Hardware information:
Machine: DELL Latitude 7490
Touchpad: DELL081C:00 044E:121F
Other log output:
IMPORTANT: I don't see any prints during the lag in neither of the two commands. When the cursor gets "teleported" a bunch of prints appear all at once.