There is a difference between display "cloning" and "mirror" mode.

Cloning means same x,y coordinates but different resolutions, so the displays 
only overlay/intersect.
Mirroring means that the resolution AND refresh rate has to be identical. 
That's how X11 defines mirror.

So if you have different refresh rates you can manually achieve
something like mirror by letting the displays overlay and by selecting
the same resolution.

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https://bugs.launchpad.net/bugs/1714302

Title:
  Mirror displays not offered, buggy

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