When you enter in a konsole the command ‘glxinfo’ check if ‘direct rending : yes ‘ if not continue with the following code:
sudo gedit /etc/X11/xorg.conf or sudo nano /etc/X11/xorg.conf
and add these lines at the end of the file:
Section “Extensions”
Option “Composite” “Disable”
EndSection
Section “ServerFlags”
Option “AIGLX” “off”
EndSection
then continue with the Installation
sudo apt-get update
sudo apt-get install linux-restricted-modules-$(uname -r) #Okay if it is already installed
sudo apt-get install xorg-driver-fglrx
Edit /etc/X11/xorg.conf and replace the string “ati” with “fglrx” in the “Device” section. This way you won’t lose your old “Screen” and “Monitor” settings.
sudo aticonfig –overlay-type=Xv
Now save any open document and reboot your system:
sudo shutdown -r now