I have found that when I am browsing the web (in Firefox or Chrome), I have this screen tearing issue. It is also visible on Youtube, Vimeo and other video site videos(flash and html5, little to none in flash). I can notice it the most on html5 videos. I have the AMD Radeon proprietary drivers installed(using Additional Drivers). My video card is AMD Radeon 6410D, processor - AMD A4-3400 APU. I am running the 64-bit version of Ubuntu and do not mind having to reinstall. (I don't know if this will help but this computer also runs Windows and I have not experienced this problem with Windows. A CD came with windows drivers for the APU).
EDIT: This also happens when I watch videos offline on media players such as VLC and Totem.
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