Hello everybody! here's the problem:
I have installed on my acer aspire 7745g osx 10.9.3, and everything works fine (even the lvds screen with both intel graphics and ati 5650m) except for the resolutions on my external monitor VGA, widescreen. The higher resolution i can get without problem is 1600x1200, cause after that my mac display 1920x1200, but my monitor can support the last one. I already installed SwitchResX, but all i get is a half black screen cause the resolution can fit the monitor (as you can see in the screenshot, if i set 1920x1080, the best resolution for my monitor, it shows me like that, with almost half of the screen black...it seems that detect my monitor as a 4:3 display).
Someone can help me, please?