Comment 18 for bug 146515

Unfortunately, that log is not using the fglrx driver, but instead the radeonhd driver. It looks like you have some inconsistencies among your install. Please follow the following steps to ensure you get everything properly loaded:

1) Open up synaptic and search for "fglrx". Ensure that xorg-driver-fglrx, fglrx-amdcccle, and fglrx-kernel-source are all "Completely Removed"
2) Backup your xorg.conf.
sudo cp /etc/X11/xorg.conf /etc/X11.xorg.conf.old
3) Run the following command to get a standard xorg.conf:
sudo dpkg-reconfigure xserver-xorg
4) Remove the contents of /etc/ati
sudo rm -rf /etc/ati
5) Reactivate the driver using the Hardware Drivers tool
6) Reboot
7) Repost your /var/log/Xog.0.log if the issue persists.