[Bug 1861610] Re: 'Elan touchpad' not detected on 'Lenovo ThinkBook 15 IIL'

Touchpad is still not working in latest kernels on Focal:
5.6.0-1017-oem
5.4.0-39-generic

Perhaps it should have it status changed from Fix released back to
Confirmed?

I'm willing to provide any information required to fix this issue in a
promptly manner.

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Title:
'Elan touchpad' not detected on 'Lenovo ThinkBook 15 IIL'

Status in linux package in Ubuntu:
Confirmed
Status in linux-oem-5.6 package in Ubuntu:
Fix Released
Status in linux-oem-osp1 package in Ubuntu:
Invalid
Status in linux source package in Bionic:
Fix Released
Status in linux-oem-5.6 source package in Bionic:
Invalid
Status in linux-oem-osp1 source package in Bionic:
Fix Released
Status in linux source package in Eoan:
Fix Released
Status in linux-oem-5.6 source package in Eoan:
Invalid
Status in linux-oem-osp1 source package in Eoan:
Fix Released
Status in linux source package in Focal:
Fix Released
Status in linux-oem-5.6 source package in Focal:
Fix Released
Status in linux-oem-osp1 source package in Focal:
Invalid

Bug description:
[SRU Justification]

[Impact]
Touchpad function unavailable on some platforms with new ELAN touchpad
HIDs.

[Fix]
https://lore.kernel.org/linux-input/000201d5a8bd$9fead3f0$dfc07bd0$@emc.com.tw/
required to match these currently unsupported IDs.

[Test Case]
1. check if platform is affected, e.g. with ELAN0634:

$ sudo acpidump | grep -C3 ELAN
2A060: 49 4E 54 31 70 0A 20 49 44 41 44 A4 84 53 42 46 INT1p.IDAD..SBF
2A070: 53 53 42 46 49 00 5B 82 42 0E 54 50 44 32 08 5F SSBFI.[.B.TPD2._
2A080: 41 44 52 00 08 49 44 41 44 00 08 48 49 44 32 00 ADR..IDAD..HID2.
2A090: 08 5F 48 49 44 0D 45 4C 41 4E 30 36 33 34 00 08 ._HID.ELAN0634..
2A0A0: 5F 43 49 44 0D 50 4E 50 30 43 35 30 00 08 5F 55 _CID.PNP0C50.._U
2A0B0: 49 44 01 14 4B 04 5F 44 53 4D 04 A0 3C 93 68 11 ID..K._DSM..<.h.
2A0C0: 13 0A 10 F7 F6 DF 3C 67 42 55 45 AD 05 B3 0A 3D ......<gBUE....=

2. check if touchpad then appear in /proc/bus/input/devices when
applied.

[Regression Potential]
Low. Only add new IDs for currently unsupported platforms.

========== Original Bug Description ==========

The Elan touchpad on my Lenovo Thinkbook isn't being detected, and
hence isn't working.

`sudo acpidump | grep -C3 ELAN` gives me the device's ACPI id:

```bash
ghosthawkzero@EchelonV:~$ sudo acpidump | grep -C3 ELAN
   2A060: 49 4E 54 31 70 0A 20 49 44 41 44 A4 84 53 42 46 INT1p. IDAD..SBF
   2A070: 53 53 42 46 49 00 5B 82 42 0E 54 50 44 32 08 5F SSBFI.[.B.TPD2._
   2A080: 41 44 52 00 08 49 44 41 44 00 08 48 49 44 32 00 ADR..IDAD..HID2.
   2A090: 08 5F 48 49 44 0D 45 4C 41 4E 30 36 33 34 00 08 ._HID.ELAN0634..
   2A0A0: 5F 43 49 44 0D 50 4E 50 30 43 35 30 00 08 5F 55 _CID.PNP0C50.._U
   2A0B0: 49 44 01 14 4B 04 5F 44 53 4D 04 A0 3C 93 68 11 ID..K._DSM..<.h.
   2A0C0: 13 0A 10 F7 F6 DF 3C 67 42 55 45 AD 05 B3 0A 3D ......<gBUE....=
ghosthawkzero@EchelonV:~$
```

Have attached the content from /proc/bus/input/devices.

**EXPECTED** - touchpad to work

**WHAT IS HAPPENING** - touchpad not detected and touchpad not
working.

More info:

LSB release:
```bash
ghosthawkzero@EchelonV:~$ lsb_release -rd
Description: Ubuntu 19.10
Release: 19.10
ghosthawkzero@EchelonV:~$
```

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: linux-image-5.3.0-29-generic 5.3.0-29.31
ProcVersionSignature: Ubuntu 5.3.0-29.31-generic 5.3.13
Uname: Linux 5.3.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ghosthawkzero 1493 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sun Feb 2 19:03:29 2020
InstallationDate: Installed on 2020-01-29 (3 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: LENOVO 20SM
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-29-generic root=UUID=c070ef84-6265-4593-a4c3-b0ceddf7e9b4 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.3.0-29-generic N/A
 linux-backports-modules-5.3.0-29-generic N/A
 linux-firmware 1.183.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/11/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: DJCN14WW
dmi.board.name: LVAC/LVAD
dmi.board.vendor: LENOVO
dmi.board.version: SDK0L77769 WIN
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ThinkBook 15-IIL
dmi.modalias: dmi:bvnLENOVO:bvrDJCN14WW:bd12/11/2019:svnLENOVO:pn20SM:pvrLenovoThinkBook15-IIL:rvnLENOVO:rnLVAC/LVAD:rvrSDK0L77769WIN:cvnLENOVO:ct10:cvrLenovoThinkBook15-IIL:
dmi.product.family: Thinkbook 15-IIL
dmi.product.name: 20SM
dmi.product.sku: LENOVO_MT_20SM_BU_idea_FM_Thinkbook 15-IIL
dmi.product.version: Lenovo ThinkBook 15-IIL
dmi.sys.vendor: LENOVO

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