[ubuntu] Ubuntu 12.04 - Graphical Artifacts - AMD Radeon HD 7420G Chip

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http://ubuntuforums.org – I find when I use Ubuntu, I get mild graphical artifacts, they are not so severe to the point that it disrupts my usage, but to the point where they can be a bit annoying. I have a Toshiba Satellite C850D laptop and I feel as it is not an issue with my hardware as I just recently purchased this laptop and my Windows 7 is working flawlessly (but I can't use Win7 after mid July :lol:). Regardless, what measures can I take to resolve this technical issue? (Hardware)