Install AMD Catalyst driver for ATI Redeon Graphics Card
Download the installer
1. Open Files (the file manager) and navigate to your Downloads folder.
2. Extract the contents of the file by right clicking on it and selecting Extract here. Open the extracted folder.
3. Right click the amd-driver-installer-xxxxxxx.run file and select Properties. Click on More and make sure your user is allowed to execute it.
4. Run the installer by clicking on amd-driver-installer-xxxxxxx.run, enter your password and follow the instruction in the installer.
After the installation, It’d ask you to reboot. Reboot you’re computer and you’re done!