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I'm struggling for more than one month, fighting to make the touchpad works on x1carbon 8th gen with Debian stretch. Yes stretch, it means the latest kernel I can work on is 4.19 (backports) The touchpad is not recognized in /proc/bus/input/devices This is the output of the xinput:

⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳ PS/2 Generic Mouse id=12 [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)] ↳ Sleep Button id=7 [slave keyboard (3)] ↳ Lenovo ThinkPad USB-C Dock Gen2 USB Audio id=8 [slave keyboard (3)] ↳ Integrated Camera: Integrated C id=9 [slave keyboard (3)] ↳ Intel HID events id=10 [slave keyboard (3)] ↳ AT Translated Set 2 keyboard id=11 [slave keyboard (3)] ↳ ThinkPad Extra Buttons id=13 [slave keyboard (3)] but the lsusb I can find some information: Bus 001 Device 004: ID 06cb:00bd Synaptics, Inc.

If I boot using ubuntu live everything is ok with kernel 5.8 and xinput identify this:

⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳ SYNA8006:00 06CB:CD8B Mouse id=10 [slave pointer (2)] ⎜ ↳ SYNA8006:00 06CB:CD8B Touchpad id=11 [slave pointer (2)] ⎜ ↳ TPPS/2 Elan TrackPoint id=15 [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)] ↳ sof-hda-dsp Headset Jack id=12 [slave keyboard (3)] ↳ Intel HID events id=13 [slave keyboard (3)] ↳ AT Translated Set 2 keyboard id=14 [slave keyboard (3)] ↳ ThinkPad Extra Buttons id=16 [slave keyboard (3)]

I have tried everything, kernel parameters, changed between synaptcs and libinput drivers, change re-compile kernel with some i2c parameters. No luck so far. Go to buster or another Linux OS with a new kernel is not an option. Does anyone have an idea?

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(I can't comment yet, so I have to write here... this "lovely" website, right? LOL)
I was able to make my Lenovo S145 (launch 2019) touchpad work on Manjaro 20.04 (kernel 5.8) It's an Elan touchpad, right? (these things are crappy as hell, compared to my 10 year old Synaptics touchpad which was just perfect)
Excuse me asking, but why are you using such old distro on a brand new hardware? Why are you stuck with that one?
For these particular models of Elan touchpads, you will have to look for kernel patches from 2019 onwards, I don't know how to install them, I never had to do it myself.
I think this link has some of them?
https://www.x.org/archive//individual/driver/

Latest version of Libinput there is 19-May-2020 and there's a Synaptics file from May-2018 too. Just have to find how to install them on your system.

If you ever find how to tune up movement speed on these touchpads, let me know, I'm not finding any options to fine-tune it like Synaptics had.

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