No, "sudo modprobe hid-multitouch" did nothing.
FYI, my laptop started suffering problems after a trip to New Zealand.  It 
started shutting down randomly every 10 minutes or so.  Dell support had me 
upgrade the BIOS.  The laptop stopped rebooting, but then the touchpad stopped 
being detected.  (I also did "sudo apt update", "sudo apt dist-upgrade" at the 
time, so it wasn't just BIOS updates.)  The BIOS Settings interface doesn't 
recognize the touchpad, so Dell believes there may be a hardware problem and is 
sending a new motherboard and touchpad. 
I'll let you know what happens with the hardware.  I'll also make a bootable 
USB version of Ubuntu so that we can test it with a known image.
    On Thursday, March 21, 2019, 2:10:52 AM CDT, Kai-Heng Feng 
<kai.heng.f...@canonical.com> wrote:  
 
 Does "sudo modprobe hid-multitouch" make the touchpad work?

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https://bugs.launchpad.net/bugs/1821068

Title:
  Touchpad not detected on Dell XPS 13 model 9370

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Touchpad is not working.

  I've run "sudo apt update", run "sudo apt dist-upgrade" and rebooted.
  Problem still exists.

  When I run "cat /proc/bus/input/devices", the touchpad is not listed.

  
  I ran "ubuntu-bug linux".

  
  $ lsb_release -rd
  Description:    Ubuntu 18.04.2 LTS
  Release:    18.04

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-46-generic 4.15.0-46.49
  ProcVersionSignature: Ubuntu 4.15.0-46.49-generic 4.15.18
  Uname: Linux 4.15.0-46-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  AudioDevicesInUse:
  USER        PID ACCESS COMMAND
  /dev/snd/controlC0:  mike      1509 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Mar 21 07:26:01 2019
  HibernationDevice: RESUME=UUID=43c674f8-b23d-4a8f-b188-d60f44b8b754
  InstallationDate: Installed on 2019-02-14 (34 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: Dell Inc. XPS 13 9370
  ProcEnviron:
  TERM=xterm-256color
  PATH=(custom, no user)
  XDG_RUNTIME_DIR=<set>
  LANG=en_US.UTF-8
  SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-46-generic 
root=UUID=faf516f1-21f1-41b1-8fe6-0454c10f66d0 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
  linux-restricted-modules-4.15.0-46-generic N/A
  linux-backports-modules-4.15.0-46-generic  N/A
  linux-firmware                            1.173.3
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/14/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.8.1
  dmi.board.name: 0H6H3J
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.8.1:bd02/14/2019:svnDellInc.:pnXPS139370:pvr:rvnDellInc.:rn0H6H3J:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9370
  dmi.sys.vendor: Dell Inc.

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Title:
  Touchpad not detected on Dell XPS 13 model 9370

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