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Not able to wake up my system after sleep. It just hangs , its neither taking input from key-board nor from mouse.

Even when I tries to make system sleep by ctrl + alt + l, system hangs. In both cases all that i can do is to forcefully shutdown system and reboot.

$:uname -a

Linux Ankur-desktop 3.2.0-30-generic-pae #48-Ubuntu SMP Fri Aug 24 17:14:09 UTC 2012 i686 i686 i386 GNU/Linux
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I had this problem a while ago with a laptop with a not-so-friendly video card. Check to see what video card you have and if there's any issues reported with it. Otherwise it may be a bug you have to report. – Steve Sep 27 '12 at 11:43
Throw water on it, that usually works to wake up my wife... (obviously a joke) – Gui Sep 28 '12 at 13:34

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press on the power button for only 1-2 seconds. Maybe your machine will not return from sleep by a keyboard key press.

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