I have now reverted my gnome-settings-daemon version to 2.28.1-0ubuntu1
and it behaves like this:

If I connect external monitor to my laptop nothing happens, if I run
"xrandr -q" command or open display settings applet it restores my last
configuration which I have used with external monitor connected. If I
boot the system with external monitor connected after logging in GDM it
switches xrandr configuration to last configuration used with external
monitor.

In version is 2.28.1-0ubuntu2:

If I connect external monitor to my laptop nothing happens, if I run
"xrandr -q" command or open display settings applet it switches external
monitor on together with internal monitor in side by side configuration.
If I boot the system with external monitor connected after logging in
GDM both monitors stay switched on in mirrored mode.

I prefer the behavior of the version 2.28.1-0ubuntu1 because it is more
flexible and lets user decide more, besides that new behavior crashes my
x-server because it switches to side by side configuration when external
monitor is connected and this crashes my xserver when compiz is
activated. So I think it is not bug but the behavior was changed by
developers, it would be nice when there could be more user configuration
options for xrandr plugin.

I don't know why external monitor is not detected by gnome-settings-
daemon when it is connected is it perhaps graphic driver or X11 problem,
should I report it there?

Thanks for your help!

-- 
xrandr plugin makes xrandr behave wrongly
https://bugs.launchpad.net/bugs/489765
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