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Sometimes if I lock my Ubuntu 11.04 screen, when I try to resume my work.. I see my PC hangs. The black screen does not go off. I can not even see the password prompt screen. I have to restart the PC. The same thing happens with my PC and my friends's PC.

My Sytem

  • Ubuntu 11.04 (natty)
  • Intel(R) Core(TM)2 Duo CPU E7400 @ 2.80GHz (GenuineIntel)
  • 3982 MiB (Memory)

Has anyone come across this problem?

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Heppened to me once as well. – umpirsky May 23 '11 at 9:08
Again I encountered this problem. Now a new restart. Damn! I lost my all opened programs. – BlueBird May 24 '11 at 5:27
That's it, report a bug. – umpirsky May 24 '11 at 6:55

Disable lock screen temporary,

review this link...

Disable the Screensaver Lock in Ubuntu 11.04 (Natty Narwhal)

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this looks like working for me. let me check and reply you. – BlueBird May 28 '11 at 6:53

Yes I think you are probably experiencing this bug: Natty Screensaver freezes system after some period of inactivity

It is reported in the bug thread that it can be worked around by disabling "Sync to VBlank" in the OpenGL plug-in of CompizConfig Settings Manager (ccsm), but this may not work for everyone.

The bug is marked as a "High" so hopefully it will be fixed soon. Good luck!

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I am running Ubuntu 11.04 Natty on a Dell laptop. I was unable to suspend and resume, the resume would wake the computer, but the computer did not respond. My solution was to remove the following packages:


Now suspend and resume work everytime, including just closing the lid and re-opening. :) Hope it helps.

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