How to run dual monitor with optimus

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http://askubuntu.com – I have reinstalled Ubuntu 12.04 to make a new attempt in getting the dual monitor working with my nvidia optimus. I already installed bumblebee. But still it isn't working as it should. The monitor from the laptop has not the right configuration and neither has the external Monitor (which runs with VGA). And if I try to change the resolution I get black screens and can't do anything against it. If I reboot though the old settings are back. I have searched a lot for a solution and tried quite a few things but nothing has changed. Any ideas what I can do to get this thing working? (HowTos)