Comment 8 for bug 966237

upstream wrote:

"So, the command to play around with for xi2.2 is

xinput set-prop <deviceid> "Synaptics Scrolling Distance" -<vert> -<horiz>

to find good values for vert and horiz, look at the current values with
xinput list-props <deviceid>

Note that this only works with the synaptics driver currently, and only with
version 1.6 (or 1.5.99.something).

Also note that the interia calculation in the driver seems to be broken for
negative deltas, so you'll have to set "Synaptics Coasting Speed" to 0 0 for
now, or else you'll get 'infinite scrolling'."