I installed Ubuntu 13.04 on a HP Pavilion 7000 with "graphics driver" VESA: NV31 Board-e133nz. I have no idea what graphic card is in the machine.
The installation seemed to be good. Then, booting from the HD, the screen went black. I had to use a separate monitor to see, but just before the login screen, this monitor also went black.
I booted in safe mode and only the separate monitor worked. I tried many sudo commands that I saw on the internet but nothing worked. I then went to the bumbelebee site and installed their driver, and now I can boot and see the laptop monitor.
However, the computer is so slow that I have to wait 6 1/2 minutes for it to boot. I timed it and all the other stuff is just as slow.