First of all, sorry for my english, I'm from Germany.
No option of dual-graphics appears in Catalyst (updatet version). I have an R7 270x 2gb. If i plug in hdmi cable (connection to a led-tv with potion as an monitor) my PC monitor doesn't work, only shows the wallpaper and no mouse or applications, statusbar..... this is only on the tv screen. What's my mistake?