Try to install : xserver-xorg-input-synapticsIf it is not installed, then you're most likely using libinput driver. You can try to install it and create this config file :
https://wiki.gentoo.org/wiki/Lenovo_ThinkPad_T400#Synaptics_Touchpad
Try to install : xserver-xorg-input-synapticsIf it is not installed, then you're most likely using libinput driver. You can try to install it and create this config file :
https://wiki.gentoo.org/wiki/Lenovo_ThinkPad_T400#Synaptics_Touchpad