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I am using an Dell Latitude D830 with Ubuntu 12.04. Now, when I turn off the pc, Ubuntu doesn't halt completely sometimes. I think that is due to the latest Nvidia drivers, because in the past with Ubuntu 10.10 I installed the latest drivers released by nvidia and I had the same problem. By now, "messages" file / var / log is always empty. My video card is: NVIDIA Corporation G86M [Quadro NVS 135M] PC will not turn off even with "halt -p".

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  • do you see any ACPI errors in /var/log/dmesg ?
    – Janus Troelsen
    Apr 27, 2012 at 18:15
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    This is the only strange message: [2.591986] [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work. (but it's at boot and the current driver work)
    – marste
    Apr 27, 2012 at 19:23
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    ...Same with me: Dell 830, shutdown hangs. I found ist was dropbox that prevented shutdown. When i stop dropbox before shutdown it's ok. For the clean Solution? no idea! greetings guges
    – user57438
    Apr 27, 2012 at 20:23
  • I actually removed dropbox and will now shut down properly.I also tried installing the latest available version, but without success. With which command you stop dropbox?
    – marste
    Apr 28, 2012 at 7:03
  • Unfortunately is not dropbox causing the problem. Although I do not have Dropbox, sometimes, the problem is the same.
    – marste
    Apr 28, 2012 at 10:10

2 Answers 2

Reset to default
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I think I solved it by edditing the reboot options in the grub file. How? just edit /etc/default/grub and search for the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and add the ACPI option force, to become GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force" This did the work for me. Hope it helps you guys too.

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  • this worked on my pc.
    – JCasso
    Oct 9, 2012 at 10:10
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May be related to this bug seen on Dell m1330, though only seen if using a 32 bit install & nvidia drivers 295.XX - https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/940564

Similar question here - Shutdown issues on my Dell XPS M1530

Possible solution other than going back to nouveau or downgrading to nvidia driver 290.20 - Dell Studio 1569 Cannot Shutdown in Ubuntu 11.10 or 12.04

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