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Ubuntu 11.10 64 bit on Dell Optiplex. I'm using Synergy but I'm not sure the problem is related to it.

The screen freezes after coming back from screen saver. (It's not suspend because my Power setting is Don't suspend.) The blank screen turned back to the last screen I used but no response. Mouse is still moving. Keyboard works as I can drop down to terminal using ctrl-alt-f1. Other services seems to be working by remotely logging in.

I found a temporary solution from web.

  1. Turn to the terminal using Ctrl-alt-F1.
  2. After log in, type unity --replace &
  3. Back to x windows by ctrl-alt-F7.
  4. Type password.

It works back again.

Still I do want to know how to fix. Any suggestions?

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closed as off topic by Marco Ceppi Feb 2 '12 at 3:37

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here. If this question can be reworded to fit the rules in the help center, please edit the question.

This question should instead be filed as a bug report, thanks! Instructions here. –  Jorge Castro Feb 2 '12 at 1:22