Adjust Linux Mint Mouse Scroll (Normal/Reverse)
When you install Linux Mint and install the Mtrack Multitouch drivers, as explained here. Or through the script explained in my other blog post, found here. You will have the system mouse scroll setup in the same manner as Mac OSX Lion, which is the opposite to what everyone has been using until now.
To adjust the mouse scroll you need to adjust the “.Xmodmap” file found in you home directory “~/”, to achieve this run the following command in a terminal
sudo gedit ~/.Xmodmap
You will see a file as below, you need to adjust the highlighted values
If these two values are set as “4 5″ then your scroll is normal, however if they are set to “5 4″ then your scroll is inverted or reversed.
This forum post, outlined a shortcut to adjust these and this is below:
Set Scroll Normal
echo "pointer = 1 2 3 4 5 6 7 8 9 10 11 12" > ~/.Xmodmap && xmodmap .Xmodmap
Set Scroll Inverted/Reverse
echo "pointer = 1 2 3 5 4 6 7 8 9 10 11 12" > ~/.Xmodmap && xmodmap .Xmodmap
Note: I have not personally used the short cut, but thought this was good advice.

Great thanks. Did the trick. I thought I was going mad