Alps PS/2

To get the Alps touchpad working, the kernel option ALPS PS/2 mouse protocol extension ( CONFIG_MOUSE_PS2_ALPS ) needs to be activated. Due to bug some kernel versions from gentoo-sources:4.19.63 also needed IBM Trackpoint PS/2 mouse protocol extension ( CONFIG_MOUSE_PS2_TRACKPOINT ). This is fixed since gentoo-sources:4.19.68

It can be operated using the libinput driver and the default configuration as set in should work sufficiently in most cases. Customization can be done via.

For more detailed instruction/description, see https://wiki.archlinux.org/index.php/Libinput#Common_options

In dmesg it will appear like:

and can be used to show the touchpad's characteristics:

External resources

 * https://forums.gentoo.org/viewtopic-t-1070134-highlight-.html