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when I close the laptop lid and then open it after sometime, I see the message on my screen saying "Failed to suspend". What is the problem while the laptop is trying to suspend.

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Can you tell us what graphics card you are running? Or what model your laptop is? There are a great many things that could cause this and having that information would help us narrow it down. –  cprofitt Nov 8 '10 at 16:16
    
sorry, forgot to answer the solution. its resolved. –  Gaurav Butola Nov 8 '10 at 16:43
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Finally I was able to resolve the problem by installing acpi-support from the ubuntu software centre. Here is the thread that helped me http://ubuntuforums.org/showthread.php?t=1608752

This was the cause of problem Hibernate and Suspend do not exist anymore, help.

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