For any who are affected by this, here is a work-around.  I was able to add a 
screen resolution
that was detected for my internal monitor, but not for the external one, using 
xrandr --addmode.
It gets the width of the screen right, but truncates the bottom.  However 
panning makes the
bottom accessible, so this is not a serious limitation.

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https://bugs.launchpad.net/bugs/1598993

Title:
  xrandr scaling corrupts external monitor output

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