[Bug 1895202] Re: touchpad suddenly not detected, appearing as PS/2 mouse in devices

This problem persists with Ubuntu 20.10 released today.

The modprobe/rmmod/modprobe method above still works there, however it
is very inconvenient to have to perform those steps after each reboot.
Unfortunate, as Ubuntu has been the distro that I've used and
recommended to others for the last four years based on "it just works".

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https://bugs.launchpad.net/bugs/1895202

Title:
touchpad suddenly not detected, appearing as PS/2 mouse in devices

Status in linux package in Ubuntu:
Confirmed

Bug description:
I can't even recall making any upgrades. Lenovo X1 Extreme.

~ xinput --list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Synaptics TM3418-002 id=12 [slave pointer (2)]
⎜ ↳ PS/2 Generic Mouse id=13 [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)]
↳ Sleep Button id=8 [slave keyboard (3)]
↳ Integrated Camera: Integrated C id=9 [slave keyboard (3)]
↳ AT Raw Set 2 keyboard id=10 [slave keyboard (3)]
↳ ThinkPad Extra Buttons id=11 [slave keyboard (3)]
➜ ~ cat /var/log/Xorg.0.log | grep -i synaptics
[ 12.190] (II) config/udev: Adding input device Synaptics TM3418-002 (/dev/input/event7)
[ 12.190] (**) Synaptics TM3418-002: Applying InputClass "libinput touchpad catchall"
[ 12.190] (II) Using input driver 'libinput' for 'Synaptics TM3418-002'
[ 12.190] (**) Synaptics TM3418-002: always reports core events
[ 12.192] (II) event7 - Synaptics TM3418-002: is tagged by udev as: Touchpad
[ 12.193] (II) event7 - Synaptics TM3418-002: device is a touchpad
[ 12.194] (II) event7 - Synaptics TM3418-002: device removed
[ 12.194] (II) XINPUT: Adding extended input device "Synaptics TM3418-002" (type: TOUCHPAD, id 12)
[ 12.194] (**) Synaptics TM3418-002: (accel) selected scheme none/0
[ 12.194] (**) Synaptics TM3418-002: (accel) acceleration factor: 2.000
[ 12.194] (**) Synaptics TM3418-002: (accel) acceleration threshold: 4
[ 12.195] (II) event7 - Synaptics TM3418-002: is tagged by udev as: Touchpad
[ 12.195] (II) event7 - Synaptics TM3418-002: device is a touchpad
[ 12.196] (II) config/udev: Adding input device Synaptics TM3418-002 (/dev/input/mouse0)
[ 34.235] (II) event7 - Synaptics TM3418-002: device removed

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-47-generic 5.4.0-47.51
ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ole 2093 F.... pulseaudio
/dev/snd/controlC0: ole 2093 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Sep 10 21:45:53 2020
InstallationDate: Installed on 2019-03-30 (530 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
MachineType: LENOVO 20MFCTO1WW
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-47-generic root=UUID=37b4f683-cd0d-4eb9-b05a-973790230aa4 ro i8042.reset quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.4.0-47-generic N/A
linux-backports-modules-5.4.0-47-generic N/A
linux-firmware 1.187.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/15/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: N2EET48W (1.30 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20MFCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN2EET48W(1.30):bd05/15/2020:svnLENOVO:pn20MFCTO1WW:pvrThinkPadX1Extreme:rvnLENOVO:rn20MFCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Extreme
dmi.product.name: 20MFCTO1WW
dmi.product.sku: LENOVO_MT_20MF_BU_Think_FM_ThinkPad X1 Extreme
dmi.product.version: ThinkPad X1 Extreme
dmi.sys.vendor: LENOVO

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