I have the same issue but with intel graphics. One difference is that
that the high load on Xorg goes away after about a minute and the system
behaves normally.

I can also produce this high load using 
    xmodmap -pke > .Xmodmap
    xmodmap ~/.Xmodmap

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/1395547

Title:
  xfsettingsd and xfce4-volumed using a lot of CPU after screen lock /
  unlock

To manage notifications about this bug go to:
https://bugs.launchpad.net/xfce4-settings/+bug/1395547/+subscriptions

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