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I move my laptop between places in my flat quite a bit for this I've got multiple power adaptors connected to outlets in two rooms. Now every now and again (I can't see a pattern) when I move the laptop between the two rooms with the adaptors or if I have been using the computer for a while on battery when I connect the power cable Ubuntu locks up (typically sound gets stuck in a 1-2 loop, no key or mouse response). The only thing I can do in this situation is force a shutdown by holding the power button.

Since I don't know enough about how the logs work to figure out if a hard reset kills all important information or where I could find any clues to why the laptop locks up when reconnecting power. Is there a way for me to find out what happened in the moment of switching to AC power that causes the system to freeze?

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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