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display settings and external monitor impossible with fbdev or gma500

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http://forums.fedoraforum.org – If I connect an external monitor to my sony vaio p, the external monitor seems to receive same image as the internal monitor, while having a totally different resoultion. So I see half of my desktop and in wrong dimensions. If I try to change the display settings via lxrandr or xrander or any other tool, I see the external monitor is not detected and also for the internal, I cannot change the resolution. Googling the problem, I found, that the driver for the gma500 video card is implemented in the newest kernels. But its implemented using fbdev, and fbdev does not support xrandr (and all f (HowTos)