You might want to try passing the various i8042 controller module linux
parameters (i8042.nomux=1, i8042.kbdreset=1, i8042.reset=1) and also
i8042.nopnp as told by your dmesg:

 [ 0.602905] i8042: PNP: PS/2 appears to have AUX port disabled, if this
is incorrect please boot with i8042.nopnp

note that the AUX port is the mouse.

You can set then via grub by setting GRUB_CMDLINE_LINUX="<your
parameters>" in /etc/default/grub and running update-grub as root. Or
plain edit enter then in the grub editor at boot.

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https://bugs.launchpad.net/bugs/1912880

Title:
  Touchpad (MSFT) not detected on Lenovo Ideapad Flex 5 AMD

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