Please try: Option "BusType" "PCI" in the Device section.
If that doesn't work, try installing the Feisty -ati driver on your Gutsy: https://launchpad.net/ubuntu/+source/xserver-xorg-video-ati/1:6.6.3-2ubuntu6
Please try:
Option "BusType" "PCI"
in the Device section.
If that doesn't work, try installing the Feisty -ati driver on your Gutsy: https:/ /launchpad. net/ubuntu/ +source/ xserver- xorg-video- ati/1:6. 6.3-2ubuntu6