I am using XFCE and Xonotic does not start.
My system is an AMD Athlon X3 and ATI integrated HD 4250
I have also installed Cinnamon.
Supertuxcart, Freeciv and Quake3 does work as well Quakelive at Firefox.
I have kernel 3.3 proprietary ati drivers and opengl enabled - XMBC does work -.

