Solved XFCE blank screen after enabling laptop display

Hi there. I'm just a newbie in FreeBSD, but right when I start using it I just install XFCE wm on FreeBSD 8.2, after using for a 3 month, I install new (not upgrade) FreeBSD 9.2 and still using XFCE for about half year. Now, I install new (not upgrade) FreeBSD 10, and again XFCE - very nice windows manager and light weight witch the most important for my Dell d610 laptop (2004 year). But one big issue: I always disable laptop screen and work only in addition monitor, but sometimes needs to work in both screens. So when I enable laptop screen there were blank dark screen on laptop with mouse arrow appear, on second screen there were only picture of desktop with mouse arrow, which I can move, but there were no response from buttons, or any actions, even CTRL+ALT+BCKSP would work.
To bring all back, I should unplug second VGA cable from laptop, reboot, enter in XFCE, plug VGA cable, then enable addition display, only that will bring all alive.
Thanks for any help.

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