How to get display settings persistent?

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http://askubuntu.com – I have the following set-up: laptop with screen: 1366x768 external LCD monitor with: 1024x768 The monitor is permanently connected and recognised by the system. Screen is expanded to the external monitor. But each time I login, the external monior is dark and has to be reactivated. This also happens when the monitor is active and I log out and log in as a different user. How can I prevent this? Is there a way to make configuration of the monitor settings tool persistent for all users? Thanks in advance. (HowTos)