The ATI “unsupported hardware” watermark is a very annoying sight in Linux Mint 15. Here is how to remove it.
This tip is for anyone who has installled the ATI drivers by typing sudo apt-get install fglrx fglrx-amdcccle.
Firstly; download the ATI drivers from the website.
Then move the downloaded file into a new folder and then extract the file.
Then extract the driver package.
Make a backup of your existing /etc/ati/control file.
cp /etc/ati/control /home/homer/Desktop/
And then copy the replacement file into the folder.
sudo cp fglrx-install.t5BiCT/common/etc/ati/control /etc/ati/control
After this, logout and log back into your desktop and the watermark should no longer appear.