@atztao, please append following kernel boot parameters, reboot and
attach output of `journalctl -b`:

  "dyndbg=file drivers/input/* +pt" i8042.debug=1 i8042.nopnp=1
log_buf_len=32M

For detailed steps, please see https://askubuntu.com/questions/19486
/how-do-i-add-a-kernel-boot-parameter.

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https://bugs.launchpad.net/bugs/1885270

Title:
  Touchpad stopped working after upgrading to Ubuntu 20.04

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