[ubuntu] ATI graphics drivers almost working, but strange glitch

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http://ubuntuforums.org – Having recently switched to Linux (Ubuntu 12.10), I spent a while yesterday getting my video drivers working, with a certain amount of success. I successfully installed the latest Beta driver for my Ati Radeon HD 5xxx card and had everything running smoothly. I tried running Team Fortress 2, and got an error, so I followed the instructions found on this page (http://askubuntu.com/questions/12429.../126513#126513) to reinstall my drivers 'properly'. The game works now, but I am getting a weird glitch overlaying the desktop and applications. It looks like a flashing cursor, and every 10 se (Hardware)