>You can prepare a trisquel live stick with the package "glxgears" installed.This little programm shows three running gears using 3d acceleration. You will recognize if they don't run fluently in case of no 3d acceleration.
I don't think this is very good advice. I got no hardware acceleration and the wheels look fairly smooth. Of course I can see on the terminal window that the FPS is low but can't really tell that looking at the wheels.
