I just installed 12.04, and my entire screen is being displayed entirely on the top half of my screen. The bottom half is always black or some technical garbage from the boot up. To interact with the bottom half of the screen I have to move the mouse over the screen to pull part of the bottom half of the screen on top and vice-versa. Does anyone know how to fix this? Also my computer told me, at startup, to go to here: http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware. I'm on a Dell Mini Inspiron1010, it's a fairly standard setup for a 1010(as far as I know). I don't know what model the card graphics card is though.
Looks as if you have the gma500.