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[Richard Merren <917210@xxxxxxxxxxxxxxxxxx>]

I am having this issue, and I am up-to-date with all upgrades in the
12.04 beta.  I have a HP Pavilion dv7 laptop with i7 quad core
processor, AMD/fglrx video driver.  Under unity 3d, when I lock the
screen and it goes blank, the cpu and fan spin up.  After unlocking and
bringing the screen back up, the fan spins down.  It looks like compiz
or X is the process cranking up the CPU (given that I am looking at top
and powertop just after logging back in, it is a bit like trying to
figure out if the refrigerator light actually goes off when you close
the door, but I think compiz is the culprit).  In any case, this happens
consistently under unity3d, but not under unity 2d.

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https://bugs.launchpad.net/bugs/917210

Title:
  compiz+unity3d generates > 50 wakeups a second on idle system

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