How do i get External Monitor ONLY on suse 12.4

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http://www.linuxquestions.org – Hi there after a bit of a disastrous @flirt@ with Windows 8.1 I'm back again to SUSE 12.4 on my Sony VAIO laptop One thing I just can't seem to get right is how to switch to ONLY the external Monitor I've connected an HDMI cable to it and the external Monitor is just fine - but I see the display on BOTH the laptop and external monitors -- this of course reduces the display to 1366 X 768 whne the Video card is capable of driving it at full 1080p display. Yast also shows this but I can't seem to disable the Laptop monitor. (Sound only is heard on the laptops internal speakers too rather than (HowTos)