[ubuntu] Cannot shut down

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http://ubuntuforums.org – Good afternoon!!! I have the following problem, i've installed karmic koala, everything is ok! Excpet that when i shut down my pc, system "shuts down" but laptop still is on power! I have to shut it down by pressing power button for 3-4 seconds. Any ideas? *I've added apm in /etc/modules and apm=power-off in boot/grub/menu.lst but still nothing... (Hardware)