I have a laptop and I'd like to have a horizontal scrolling on my touchpad.

Here:
viewtopic.php?f=17&t=83206

But now, on another computer these settings does not save.
It means it's working until restart.

You need to add the synclient command to your startup scripts, since synclient performs a runtime change only.

Strange...it was working earlier.. (or I thought so)

Solved, thanks