I have found an interasting thing about this problem. I Just bought cheap Logitech mouse (m-bj58) got it secondhand for 1€. Well, it has the acceleration thing and i hate it. Touchpad of my laptop is working Ok. I went to my work place where i have logitech m-bw112a and BAM! Everything is ok, no freaking acceleration. Cursor moves as fast as i move the mouse like it should. So it's related to the mouse you are useing. So now is the time to find out, WHY M-BJ58 has acceleration and M-BW112A hasen't.