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It didn't happen in my computer, but in my girlfriend's pc. She upgraded to maverick and now it doesn't shutdown properly, the screen just freezes and she has to shutdown pressing and holding the power button. I've tried adding:
apm power_off=1 to /etc/modules and
acpi=force to etc/default/grub config, but it still doesn't work... By the way, the computer is new, it's just like 3 weeks old so the hardware should not be that outdated.

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put on hold as off-topic by Braiam, dn-ʞɔɐq ɹW, kos, David Foerster, Eric Carvalho Feb 8 at 15:04

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Bug reports and problems specific to development version of Ubuntu should be reported on Launchpad so that developers can see, track and fix these issues." – Braiam, dn-ʞɔɐq ɹW, kos, Eric Carvalho
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Can you be specific as to what you added to /etc/modules? – Jorge Castro Nov 5 '10 at 0:22
    
Of course, what I added was "apm power_off=1" in /etc/modules. I didn't remember what I put when I wrote the question^^ – daas88 Nov 6 '10 at 12:42

There are 3 (or more?) ways to turn off a computer, and not all of them work with all hardware. Apparently on your girlfriend's PC the wrong method is chosen in Maverick.

Best you can do is file a bug against the kernel with the following command (run on the computer with the problem—it will collect necessary info about the hardware, the kernel, etc.):

apport-bug linux

And answer the questions & explain the problem on the Launchpad site when asked for it.

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Thanks, I'll tell her to do that when she's home. – daas88 Nov 6 '10 at 12:54

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