fix Synaptics touchpad scrolling speed

scroll-mouse.sh

#!/bin/bash
# xinput set-prop 12 345 30

device_num=12 # default value if can not find
for i in $(xinput list | awk -F 'Synaptics' '{print $2}')
  do
    if [[ "$i" == *"id"* ]]; then
      device_num=$(echo $i | awk -F 'id=' '{print $2}')
    fi;
done;

xinput set-prop "$device_num" 345 30;