How to solve dual monitor issue, which happens only during X start?

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http://askubuntu.com – When desktop graphical environment is loading with two monitors connected to the notebook system drops to 'rescue launch' - poor gray frame on black background with couple of options appears. Something like reset graphic settings ... ... boot to console I'm switching to console. After disconnecting by hand the secondary monitor cable, restart lightdm with a command sudo service lightdm restart ...system loads fine If I disconnect the cable before boot X will be loaded fine too. It's not a nice 'feature' when I have to disconnect the cable each boot or X restart. I was trying to delete (HowTos)