I just happened to see this bug and wonder if the following steps useful

modify the file /lib/udev/keymaps/lenovo-ideapad
0xf2 unknown                    # trackpad enable/disable (does nothing in BIOS)
change the above line to
0xf2 f21

Reboot, and try

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https://bugs.launchpad.net/bugs/717931

Title:
  Unknown Keycode for Touchpad toggle

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