How to make nouveau driver work in Ubuntu 9.10

Using the reverse engineered open source nouveau driver for nvidia cards.
Update to the latest, and install the driver.

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

# install the driver
# this will emove your proprietary nvidia driver, in case you have that installed.
sudo apt-get install xserver-xorg-video-nouveau

# gedit /etc/X11/xorg.conf

Section "Screen"
Identifier "Default Screen"
SubSection "Display"
Virtual 3840 3840
EndSubSection
EndSection

Section "Device"
Identifier "Default Device"
Driver "nouveau"
Option "NoLogo" "True"
EndSection

Run this to make sure it's working

glxinfo | grep direct
direct rendering: Yes

Note:
This driver does not support 3D. If you need 3D support you still have to install the nvidia proprietary driver.