Hy! If you open the Display settings somewhere in your distro than you should find the resolution changer and the change it to your resolution, and you should select that 'to start with this resolution' to be the "default" every time you boot. Try it! It should work! Or there is another way to configure the XFREE Settings, try in a terminal: startx --config but this will work when your graphical environment is not running. Good Luck!