I just bought a Dell 14z (in Brasil) and installed the latest long term Ubuntu (12.04.1). I managed to get the aditional ATI/AMD installed. The problem is that it will not work with 3D acceleration for some reason. When I log in after installing I can not use the Unity 3D interface and it defaults to the 2D version. I have tried many re-install versions on the web but none have worked. If I remove the driver the Unity 3D interface works fine with the generic driver but I am having issues setting resolutions when I use the hdmi output for example. Does anyone have any idea how to fix this?
The card seems to be a AMD HD 7570M.