Comment 2 for bug 1874374

The touchpad/touchpad driver in question is ELAN0634. A possible fix would be to add {"ELAN0634", 0} to /include/linux/input/elan-i2c-ids.h (refer to https://github.com/ihasdapie/linux/commit/a7ac88d20464b502027c0b313469a277f15da304)

Attempting to apply patches found in Bug#1853277, 1861610:
-> Changing dsdt.dsl does not work: no "Name (_HID, 'XXXX0000')" Found
https://github.com/realnickel/lenovo_thinkbook_iml15_touchpad_acpi_fix/commit/de0ca637f7d8de2164c787801b4af9d4ff586d67

Here is part of dsdt.dsl that may be relevant

      Device (TPD2)
        {
            Name (_ADR, Zero) // _ADR: Address
            Name (IDAD, Zero)
            Name (HID2, Zero)
            Name (_HID, "_HIDELAN0634") // _HID: Hardware ID
            Name (_CID, "PNP0C50" /* HID Protocol Device (I2C bus) */) // _CID: Compatible ID
            Name (_UID, One) // _UID: Unique ID
            Method (_DSM, 4, NotSerialized) // _DSM: Device-Specific Method
            {

What is "HIDELAN0634?"

I have also tried changing grub options e.g. i8042.nomux..which do not work.