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I have installed a brand new 12.04 on my Dell XPS M1330 laptop. Initially, it is able to reboot/shutdown normally. However, after I installed my first software, ubuntu-tweak, my laptop was frozen in the reboot/shutdown process consistently, result in a black screen.

Because of my suspicion, I remove and purge ubuntu-tweak, then try again. It worked this time! It is obvious that ubuntu-tweak cause this power manager problem on my laptop.

However, I have encountered another reboot/shutdown freeze after I started to install most of popular programs in the Ubuntu Software Center. I have been force logout during the installation. After that, my laptop have the reboot/shutdown freeze constantly!

I am wondering what kind of bug would cause this problem and how to resolve it. Any idea?

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is your system up-to-date? –  Alen Jul 12 '12 at 11:37
    
Yes, I update it after my installation. It can be rebooted or shutdown normally then. However, after I installed ubuntu-tweak and some other packages, I have those problem. Now I have to shutdown my laptop by push power button for 5 seconds.....every time! –  TKY Jul 13 '12 at 9:36
    
is Ubuntu 12.04 your first Linux distribution, did you use some other distributions, or maybe an older version of Ubuntu. If so, tell me whether the problem was present in those distributions. –  Alen Jul 13 '12 at 14:35
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1 Answer

up vote 1 down vote accepted

Sorry, I think I made a wrong inference.

Today, my laptop can be rebooted and shutdown normally. It's not a miracle, but I found that turn on the bluetooth could solve this problem.

I have turned off bluetooth via system tray icon after my installation, since I never use it. Therefore it hard to discovery this action will effect the power management. Today my laptop can be reboot and shutdown normally but unexpectly, because, for some unknown reasons, my bluetooth have been turn on without intention.

I have turned it on and off several times for experiment, and it turns out that the bluetooth is the cause of freeze, I would encounter a freeze black screen during rebooting or shutdown only if I turned off bluetooth in system settings, no matter what applcations I have installed.

For anyone who have the same power management issue on your laptop, try your bluetoolth first!

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