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I can't recall exactly, but I thought 13.12 from AMD only worked up to kernel 3.9 without a patch or something. If it's the 13.12 from Ubuntu's repository though, I believe that worked either up to 3.12, or one of the 3.13 daily builds...
In any case, did you follow proper setup instructions? This covers a manual install, I believe Ubuntu's driver doesn't require most of that though, but there is that initial config you'll need to generate (preferably) before reboot.