I have updated to linux 18.04 (it's a pop os machine, which was based on the previous version of ubuntu) using do-release-upgrade and now the touchpad cursor freezes if I move it a bit quickly.

That is, if I move it slowly and steady it works, but as soon as I accelerate a little bit it blocks, and then I have to raise my finger and put it down once again. All this is really annoying.

The usb mouse works ok, on the other hand.

Some info about my linux

sas@pop-os:~$ inxi -Fxxxz
System:    Host: pop-os Kernel: 4.15.0-45-generic x86_64 bits: 64 gcc: 7.3.0
           Desktop: Gnome 3.28.3 (Gtk 3.22.30-1ubuntu1) info: gnome-shell dm: gdm3
           Distro: Pop!_OS 18.04 LTS
Machine:   Device: portable System: Dell product: Dell System XPS L321X serial: N/A
           Mobo: Dell model: N/A serial: N/A
           UEFI [Legacy]: Dell v: A01 date: 12/27/2011
           Chassis: type: 8 v: 0.1 serial: N/A
Battery    BAT0: charge: 2.8 Wh 18.0% condition: 15.7/47.7 Wh (33%) volts: 7.7/7.4
           model: SDI Dell Li-ion serial: <filter>status: Charging cycles: 0
CPU:       Dual core Intel Core i5-2467M (-MT-MCP-) 
           arch: Sandy Bridge rev.7 cache: 3072 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 6385
           clock speeds: min/max: 800/2300 MHz 1: 990 MHz 2: 850 MHz 3: 922 MHz
           4: 970 MHz
Graphics:  Card: Intel 2nd Generation Core Integrated Graphics Controller
           bus-ID: 00:02.0 chip-ID: 8086:0116
           Display Server: x11 (X.Org 1.19.6 ) driver: i915
           Resolution: 1366x768@60.00hz
           OpenGL: renderer: Mesa DRI Intel Sandybridge Mobile
           version: 3.3 Mesa 18.2.2 (compat-v: 3.0) Direct Render: Yes
Audio:     Card Intel 6 Series/C200 Series Family High Def. Audio Controller
           driver: snd_hda_intel bus-ID: 00:1b.0 chip-ID: 8086:1c20
           Sound: Advanced Linux Sound Architecture v: k4.15.0-45-generic
Network:   Card: Intel Centrino Advanced-N 6230 [Rainbow Peak]
           driver: iwlwifi bus-ID: 02:00.0 chip-ID: 8086:0091
           IF: wlp2s0 state: up mac: <filter>
Drives:    HDD Total Size: 128.0GB (85.6% used)
           ID-1: /dev/sda model: SAMSUNG_SSD_PM83 size: 128.0GB
           serial: <filter> temp: 0C
Partition: ID-1: / size: 14G used: 11G (84%) fs: ext4 dev: /dev/sda1
RAID:      System: supported: linear multipath raid0 raid1 raid6 raid5 raid4 raid10
           No RAID devices: /proc/mdstat, md_mod kernel module present
           Unused Devices: none
Sensors:   System Temperatures: cpu: 56.0C mobo: 56.0C
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 251 Uptime: 14 min Memory: 2180.2/3830.9MB
           Init: systemd v: 237 runlevel: 5 Gcc sys: 7.3.0
           Client: Shell (bash 4.4.191 running in terminator) inxi: 2.3.56 
sas@pop-os:~$ uname -a
Linux pop-os 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

sas@pop-os:~$ ls /usr/bin/*session
/usr/bin/dbus-run-session  /usr/bin/gnome-session-custom-session
sas@pop-os:~$ xinput 
⎡ Virtual core pointer                      id=2  [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4  [slave  pointer  (2)]
⎜   ↳ OM                                        id=11 [slave  pointer  (2)]
⎜   ↳ CyPS/2 Cypress Trackpad                   id=14 [slave  pointer  (2)]
⎣ Virtual core keyboard                     id=3  [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5  [slave  keyboard (3)]
    ↳ Power Button                              id=6  [slave  keyboard (3)]
    ↳ Video Bus                                 id=7  [slave  keyboard (3)]
    ↳ Power Button                              id=8  [slave  keyboard (3)]
    ↳ Sleep Button                              id=9  [slave  keyboard (3)]
    ↳ Laptop_Integrated_Webcam_1.3M:            id=10 [slave  keyboard (3)]
    ↳ Dell WMI hotkeys                          id=12 [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=13 [slave  keyboard (3)]

I tried with several commands, but couldn't find one that gives me information about the touchpad.

edit: I found a couple of questions with similar troubles.

How do I make my Dell XPS 13 Developer Edition touchpad work correctly in 18.04?


Synaptic touchpad on laptop not working


this workaround sort of works, but the touchpad configuration is lost (no click on touch, no two-fingers scroll, etc.) as pointed in here

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