ELANTECH Touchpad is not detected in 'Lenovo Lenovo IdeaPad S145-15IIL'

[Yaron Artzi]

I have installed Ubuntu 16.04 on my new Lenovo Lenovo IdeaPad S145-15IIL. The touchpad (ElanTech 0633) is not working.
From notes/discussions in: https://askubuntu.com/questions/1049787/lenovo-ideapad-330-touchpad-not-working, it seems to me that the problem is that my touchpad id is not listed in the ubuntu kernel, and so ubuntu doesn't recognize it.
Running 'xinput -list' doesn't show the touchpad.
By running 'sudo acpidump | grep -C3 -i elan', I can see that my ElanTech touchpad id is 0633.

1) My ubuntu release: Ubuntu 16.04.6 LTS (16.04)

2) My kernel version (uname -srv): Linux 4.15.0-74-generic #83~16.04.1-Ubuntu

3) Expected behaviour: ubuntu boots up -> mouse cursor can be controlled by the touchpad, and it should respond to touchpad clicks and scroll gestures.

4) Actual behaviour: ubuntu boots up -> mouse cursor can NOT be controlled by the touchpad, and it DOES NOT respond to touchpad clicks and scroll gestures at any point in time.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.15.0-74-generic 4.15.0-74.83~16.04.1
ProcVersionSignature: Ubuntu 4.15.0-74.83~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-74-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.21
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jan 28 00:43:20 2020
InstallationDate: Installed on 2020-01-18 (9 days ago)
InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release amd64 (20190227)
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

[Yaron Artzi (yaron160)]

This bug is still not fixed on the kernel version: 4.15.0-76-generic

[Yaron Artzi (yaron160)]

This bug is still not fixed on the kernel version: 4.15.0-87-generic

[Yaron Artzi (yaron160)]

Still not fixed on the kernel version: 4.15.0-88-generic

[Yaron Artzi (yaron160)]

Still not fixed on the kernel version: 4.15.0-89-generic

[Yaron Artzi (yaron160)]

After seeing no solution to this bug, I upgraded my ubuntu distribution (fresh install) to ubuntu 18.04.4 LTS. The problem still persists in that dist.
I'm leaving this bug open for future reference, and I opened a new bug with the new bug information, collected in the new dist. (https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe/+bug/1864690).

[U.B. Untoo (peterzen)]

I'm having the same issue on S145 15IIL (ElanTech 0633) both 18.04 and 19.04. On the latter, I've tried on 5.6.2 stock and 5.4.19 (mainline) to no avail.

dmesg|grep -i elan does not recognize the device.

I've tried adding the 0633 ACPI id to include/linux/input/elan-i2c-ids.h but it did not help.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.