I should point out that I am using the repository ppaorg-edgers/ppa.
I wouldn't recommend using the xorg-edgers ppa unless you know it has something that will work for you, especially in Vivid. You are using bleeding edge xorg and video drivers on a still somewhat bleeding edge version of a *buntu.
A bit of trivia: the tool ppa-purge was originally created by the xorg-edgers folks to allow users to be able to revert back to the original xorg stuff without breaking things.
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