Why do I have a black screen using Nouveau with Quadro FX 1800M?

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http://askubuntu.com – I have Ubuntu 12.04 on a notebook HP Elibook 8540w, working with the recommended additional NVidia driver. The graphic card is a QUADRO FX 1800M. Since the NVidia driver causes several problems, I tried to switch to Nouveau, following the guide lines of http://nouveau.freedesktop.org/wiki/UbuntuPackages: I Installed the xserver-xorg-video-nouveau package using Synaptic I removed the NVidia driver going to System Settings / Additional Drivers and Clicking on "Remove" I saved the minimal /etc/X11/xorg.conf file, i.e. Section "Device" Identifier "n" Driver "nouveau" EndSection Rebooting the (HowTos)