Until yesterday, all worked fine to me: GraphicsEnabler= yes and AtiConfig=Flicker and i was able to use mavericks with external display and internal (laptop lvds) display both. Yes, i had always the double screen error, but it wasn't that bad to me.
Yesterday, then, i wanted to update mavericks from 10.9.1 to 10.9.2
All went good...then i wanted to switch from external to lvds (the exactly way i did with 10.9.1, wich worked) and i've got this:
how to make work my internal display??
Thanks to everybody