Unknow monitor with asus u36sd

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http://forums.fedoraforum.org – I have succesfully used Fedora from version 15 to 18 on my laptop Asus u36sd. I bought a new disk (sshd) and additional RAM and installed a fresh Fedora 19 today. Works great except that I have an additional "Unknown display" detected with a lower resolution than the built-in display. I did not care at first until I hit the button that switch between having all displays sharing same output or being independent outputs, and since this moment my laptop display ils showing black unless I have connected an external display. Whatever I do in system settings, if I unplug the external displ (HowTos)