Guys, I found the origin of problem. Gnome3 changed your politics
about power management and now, when an external monitor is connected,
gnome-settings-daemon doesn't suspend/hibernate the laptop. See it:
http://blogs.gnome.org/hughsie/2011/02/02/is-gnome-3-going-to-melt-your-
laptop/
So, either
I find out a workaround but I'm using TwinView.
See: https://bugs.launchpad.net/ubuntu/+source/gnome-
panel/+bug/375503/comments/10
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https://bugs.launchpad.net/bugs/58977
Title:
I find out a workaround! :)
Move the lower gnome panel to second screen with ALT + click-and-hold. I
have attached a screenshot.
** Attachment added: screenshot.png
https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/375503/+attachment/1729094/+files/screenshot.png
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maximized