I have Dell Latitude E5510 and Kubuntu 11.10.
The system responsiveness becomes  very slow after opening the lid. The mouse 
cursor moves with ~1 second pauses.

The state is fixed, if switching to the console (Ctrl+Alt+F1) and back
(Alt+F7).

Note that manual turning of the display off does not cause the problem:
    xset dpms force off

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https://bugs.launchpad.net/bugs/870804

Title:
  xorg issue when lid is opened

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