Flashing screen in fullscreen games.

Hi Auyx,

I saw this same problem recently.
It was solved by downloading and compiling the latest driver from the ATI website. ( http://ati.amd.com/support/drivers/linux/linux-radeon.html )

You will need to uninstall the previous versions by opening a terminal/konsole and typing:
sudo apt-get remove fglrx*

Then, the downloaded package being in your home, you must right-click and make it executable, and then enter this in a console:
sh ./ati-driver-installer-8-4-x86.x86_64.run --buildpkg Ubuntu

This will create 4 .deb packages in your home, now you will have to install them starting with xorg-driver-fglrx_8.476-0ubuntu1_i386.deb (or similar, version number might change...) using:
sudo dpkg -i xorg-driver-fglrx_8.476-0ubuntu1_i386.deb

And then install the others in the same way, the order is not important for them, only the first one must be the right one.

Finally, so that changes take effect, type:
sudo aticonfig --initial -f

Then restart your PC and it should work, to test it you can type:
fgl_glxgears
and see if it still flickers...

Also, you will notice that a new catalyst control center will have appeared in your accessories.

I hope this solves your issue, it's a bit long but it works...

have a nice day/evening,
pep.

Thanks so much for the quick and excellent response that I am sure works great but I have a bit of a problem. I followed all of the steps and everything was going fine untill I was about to run the last line ie sudo aticonfig --initial -f. I had a power cut and never got chance to run that line and now when I restart the machine all I get is a white screen with the mouse curser. I have tried to run the line from the terminal by pressing Ctrl+Alt+F1 but it says that the configuration file is not there. Thanks so much for the advice again and I hope you can help me to fix this so I don't have to format re-install Ubuntu .

Hi Auyx!

Oh, that's bad :/ You surely are unlucky :)

What I would do, is booting in safe mode and entering a superuser console, then running 'dpkg-reconfigure xorg'. This should create you the same xorg.conf file as you had just after the installation.

Then reboot normally and start it over again... hoping it works this time!

And just for your info, it is this page that was followed in the first place, so if you understand a little french: http://doc.ubuntu-fr.org/catalyst

Have a nice day,
Pierre Vorhagen,
pep.