To use double monitor in extented mode you can use xrandr tool. To identify your monitor just type xrandr [onur@onur ~]$ xrandr Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 8192 x 8192 VGA-0 connected 1280×1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm 1280×1024 60.0*+ 75.0 1280×960 60.0 … Read more
