Text consoles on Linux don't work, caused by nVidia driver

Text consoles on Linux don't work, caused by nVidia driver

I'm using Kubuntu 9.04, a GeForce 9800M GS (laptop) video card with nVidia's drivers, version 180. If I press Ctrl-Alt-F1 (or F2-F6) I should go to a fullscreen text console (instead of the X server running on terminal 7). This works if I use the default drivers, but not if I use the nVidia ones. Instead, it goes to a fully black screen (backlight off), with sound no longer audible (songbird is so nice to actually pause the music)