Sorry, to add xdpyinfo gives

default screen number:    0
number of screens:    1

screen #0:
  dimensions:    2560x1200 pixels (678x318 millimeters)
  
which is indeed what's happening: each screen can pan vertically.  2560=1280 
times 2, but where does the 1200 come from?

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External monitor resolution can't be changed on laptop (ati driver)
https://bugs.launchpad.net/bugs/227520
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