The FSF has a pretty clear definition of freedom but on my system I decide
what to do :)
A good approach to test things with a propritary driver without messing up
your freedom OS is using a live distribution like Kanotix. At least that is
what I would do when I run a pure Trisquel installation on my main system
(which I do not do).
May I ask which GPU you have ? Most likely an AMD / ATI since NVidia cards
have become quite powerful even when using the free Noveau. Although newer
modells are not supported that well (unless you use a bleeding edge kernel).
