I'm running Ubuntu 12.10 quantal with the amd-catalyst-13.8 beta2
drivers downloaded from the AMD website and compiled/installed on the
system.  I've not tried GNOME but I've seen this in the other xsession
environments.  The primary use of this box is running a standalone xbmc
instance though.  Whenever the screen is shut off (either by standard
delay or xset dpms force off) the cpu usage shoots up to 100%.  The card
is a Radeon HD 7310

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https://bugs.launchpad.net/bugs/969860

Title:
  fglrx uses 100% CPU when screen turns off (spinning in
  glXWaitVideoSyncSGI or glXSwapBuffers)

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