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I have acer 4732z with ubuntu 13.10 installed. but I can't get how to make it to extend desktop mode when I plug a monitor to my notebook.

I only can switch to

  • monitor only

  • laptop display only

  • duplicate display

And I can't make it to be "extend desktop" mode, but I don't know , is it depends on my laptop hardware.

May be if you don't understand what I mean. The picture below is my windows 7 in extend desktop mode.

enter image description here

How to fix this issue ?

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