libinput and AlpsPS/2 ALPS DualPoint TouchPad

[Sérgio Basto]

Hi, 
After read synaptics will be deprecated, I tried change my touchpad to
libinput but vertical scroll doesn't work [1]. The story of detect
this ALPS is back from 2009 [2], have we any place more specific to
track download libinput problems ?. I'm using Fedora 23, xorg-x11-drv-
libinput-0.16.0 and xorg-x11-drv-synaptics-1.8.3. 
Another question how I disable libinput and enable synaptics, in
xorg.conf, because I just can have synaptics working when I remove
libinput package , which for tests is very annoying . 

Thanks, 

[1]
https://blog.laimbock.com/2014/11/23/howto-fix-a-too-sensitive-touchpad-on-linux/
https://blog.laimbock.com/2014/11/23/howto-fix-a-too-sensitive-touchpad-on-linux/#comment-75509

[2]
https://bugzilla.kernel.org/show_bug.cgi?id=14660

-- 
Sérgio M. B.