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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