Can't change screen Resolution HP dm4 graphic card issue

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http://forums.fedoraforum.org – Hi all, I'm using Fedora 18 on my HP dm4 notebook. My notebook has a core i5 + AMD Radeon HD 6470M inside. So i have two Graphic cards. I had to install Fedora in Basic graphic mode, because otherwise the screen turned black during installation. After installation I had just one resolution i could choose (1024x768) I wasn't able to change Resolution to 1366x768, i think it's because there were no graphic driver installed. 1. I made a hole system update hoping this would solve the problem (after updating the system i wasn't still able to change the screen resolution). 2. I found this p (HowTos)