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I just upgraded to 11.04 and have been having this issue. I'm using the Unity interface, my card is an Intel GM965.

When I close my laptop lid I have it set to just blank screen. When I open the lid again, the mouse moves but nothing is responsive. I can switch to a terminal but when I switch back, the terminal text remains there with just the mouse moving again. I have to do a gdm restart to get Unity back.

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same here, but that was present event in older versions and - for me, touchpad or keyboard can stop working at any time.. – Rodislav Apr 29 '11 at 7:12
Having the same issue on an inspiron 15n, using classic mode. Then again, I'm also getting random disk swapping. :-/ – user15911 May 1 '11 at 18:44
up vote 4 down vote accepted

Here's the relevant bug report:

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Some possible fixes:

  • Setting "OpenGL > Sync to VBlank [off]" in compiz settings manager (if you don't have it, sudo apt-get install compizconfig-settings-manager)
  • killing gnome-power-manager (or remove it from start-up apps)
  • Setting a screensaver

In my case though, none of those had any effect. I am still affected with the problem, but hopefully, since those worked for other users, they might work for you

ps: I know the question is old, but it appears in the first results of google when looking for the problem so I figured it should be answered

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A workaround that does the trick for me: Before closing the lid, I open a new session (ctrl-alt-f2). Your session can be resumed with ctrl-alt-f7 or f8 (depends) when you open the lid. Works flawlessly here. – Xananax Dec 27 '11 at 21:07

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