laptop external monitor change in F17

[Zebee Johnstone]

I upgraded to Fedora 17 using a new install of / but keeping my old
/home on a different partition.

My laptop is usually attached to a dock, and f16 handled that fine.  I
had the 2 displays one on top of the other and the higher resolution
external display had its high resolution and the lower resolution
laptop one kept its.  I usually have the laptop closed and don't use
it.

But now there's a "unify" checkbox in system settings and if I use
that then the external display is forced to the low laptop resolution
but if I don't unify then the "main" display is the laptop and various
saved windows are not on the external monitor.   I can't work just
using the external monitor but have to have both open.

So I have to disable the laptop display which is annoying.  (and what
effect would saving that have if I boot up without the external
monitor?)

is there a way to get back to the previous behaviour?

Zebee