Revert back to the open source drivers
After installing drivers from deb packages
Remove all the fglrx traces from your system:
sudo apt-get remove --purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev*
Remove your xorg.conf
sudo rm /etc/X11/xorg.conf
Reinstall xorg
For 32bits systems
sudo apt-get install --reinstall xserver-xorg-core libgl1-mesa-glx libgl1-mesa-dri
For 64bits systems
sudo apt-get install --reinstall libgl1-mesa-glx:i386 libgl1-mesa-glx:amd64 libgl1-mesa-dri:i386 libgl1-mesa-dri:amd64 xserver-xorg-core
Configure Xorg
sudo dpkg-reconfigure xserver-xorg
Reboot:
sudo reboot
After the reboot all the fglrx packages will be gone, you will be using default ones.
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