Public bug reported:

The upgrade from linux-image-4.15.0.69-generic to 4.15.0.72-generic
caused the touchpad on my Dell Inspiron 11 3168 (Inspiron 11 3000
series) running Xubuntu 18.04.3 LTS not to respond to taps, slides, or
clicks.

dmesg | grep -i mouse

[    1.654993] mousedev: PS/2 mouse device common for all mice
[    2.450725] hid-rmi 0018:06CB:7D47.0001: input,hidraw0: I2C HID v1.00 Mouse 
[DELL074D:00 06CB:7D47] on i2c-DELL074D:00
[    6.393181] psmouse serio1: Failed to deactivate mouse on isa0060/serio1
[    6.513852] psmouse serio1: Failed to enable mouse on isa0060/serio1
[    7.540695] input: PS/2 Generic Mouse as 
/devices/platform/i8042/serio1/input/input6
[    7.604635] psmouse serio1: Failed to enable mouse on isa0060/serio1
[ 1482.588242] usb 1-1: Product: USB Optical Mouse
[ 1482.626514] input: USB Optical Mouse as 
/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.0/0003:0461:4D64.0004/input/input19
[ 1482.685476] hid-generic 0003:0461:4D64.0004: input,hidraw2: USB HID v1.11 
Mouse [USB Optical Mouse] on usb-0000:00:14.0-1/input0
[ 1558.549235] psmouse serio1: Failed to disable mouse on isa0060/serio1

The touch screen still works, the keyboard still works, and an external
USB mouse works (see 1482 in dmesg). I tried Settings > Mouse and
Touchpad > Devices > Synaptics TM3207-001, but turning "Enable this
device" off and on did not work. It remains not working after suspending
and resuming (see 1558 in dmesg).

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-72-generic 4.15.0-72.81
ProcVersionSignature: Ubuntu 4.15.0-72.81-generic 4.15.18
Uname: Linux 4.15.0-72-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  pino       1286 F.... pulseaudio
CurrentDesktop: XFCE
Date: Tue Dec  3 11:12:05 2019
InstallationDate: Installed on 2018-06-10 (541 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: Dell Inc. Inspiron 11-3168
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-72-generic 
root=UUID=ccf02b34-9d5c-4aeb-9ff2-b8526341f1a0 ro quiet splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-72-generic N/A
 linux-backports-modules-4.15.0-72-generic  N/A
 linux-firmware                             1.173.12
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/31/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.3.0
dmi.board.name: 0219X2
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: 
dmi:bvnDellInc.:bvr2.3.0:bd01/31/2018:svnDellInc.:pnInspiron11-3168:pvr2.3.0:rvnDellInc.:rn0219X2:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.family: Inspiron
dmi.product.name: Inspiron 11-3168
dmi.product.version: 2.3.0
dmi.sys.vendor: Dell Inc.

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


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1854966

Title:
  Touchpad on Dell Inspiron 11 3000 series stopped working in 4.15.0.72

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