Lenovo Touchpad “Disable while mouse is connected” does not work

[devnulljp]

Yesterday, without my having changed anything that I'm aware of, the Touchpad on my Thinkpad doesn't disable when a mouse is plugged in (or when typing).
I keep hitting it while typing and it jumps focus to other parts of the screen .... which is why I set it this way in the first place.

System Settings -> Touchpad -> Disable Touchpad while typing and Disable Touchpad when mouse is plugged in are both selected but Touchpad is no longer disabled.

I tried different Timeout settings but it doesn't make a difference.
I could disable in the BIOS but I'd like to be still able to use it when travelling without a mouse

[devnulljp]

Fixed it.
For posterity (using libinput):

sudo vi /etc/X11/xorg.conf.d/30-touchpad.conf

and add:

Section "InputClass"
    Identifier "touchpad"
    Driver "libinput"
    MatchIsTouchpad "on"
    Option "SendEventsMode" "disabled-on-external-mouse"
EndSection

# https://gitlab.freedesktop.org/libin...t/-/issues/924

[Snowhog]

Have you tried switching to Desktop Session: Plasma (Wayland) when you log in to see if the touchpad/plugged in mouse behaves better?

[jlittle]

Thank you. When I had a work Lenovo I didn't get this to work; but I used the touchpad so rarely that a shortcut to toggle it was good enough. I'd recommend that anyone set that shortcut anyway; it was no fun with no mouse, no touchpad and no desk (hence an unsteady actual lap) using the "TrackPoint" to find the setting to turn on the touchpad.