I installed Manjaro after after the mice and pointing device suddenly disappeared on windows 10. I tried to reinstall synaptics, but it didn't still work.
Now i am having the same issue with manjaro xfce-20. When i first installed the touchpad was working erratically. Sometimes it will just stop working. I reinstalled, used the terminal to reinstall synaptics, but still didn't work. After a while i decided to check again the pointing device in settings. I found out that synaptics was also gone - it was there before - only my wireless mouse was listed.
I don't know how to resolve this issue.
I use toshiba L850.