If you are trying to set up the second screen using catalyst then you probably need to disable xrandr. Have a look here: http://ubuntuforums.org/showpost.php?p=7170485&postcount=2
If you are trying to set up the second screen using catalyst then you probably need to disable xrandr. Have a look here: http:// ubuntuforums. org/showpost. php?p=7170485& postcount= 2