a while ago I installed the Steam and while I can play some Indy titles on my HP 2560p with Intel i5-2540M, Steam always nags me about adding the x-swat PPA for the Intel driver. When this is done and the laptop is restarted, it will boot and show the Plymouth(?) bootlogo and the mouse pointer. And nothing else. The mouse can't be moved, the keyboard does not react.
The same happens when booting up any Ubuntu 13.04-version.

How can I figure out what is wrong here and submit a proper bugreport? What information will be needed?