Ubuntu – Shutdown does not power off computer


I recently upgraded from Ubuntu 11.10 to 12.04. If it makes any difference, my system is a Dell Inspiron 1520.

I encounter a problem whenever I shutdown or restart; it kills all running processes (as far as I can tell), but once I get past the shutdown text screen and the screen goes black, my computer doesn't power off. The fans still run and the screen is still on, etc. I have to hold down the power button in order to complety shut down.

Does anyone know how to resolve this problem?

Best Answer

  • I have the same problem and found a solution which worked out for me.

    Type in terminal:

    1. sudo -i (to get a root shell, sudo gedit is not recommended)
    2. gedit /etc/default/grub
    3. Find the line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    4. Change this to: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force"
    5. Save the file and close the file.
    6. Finally, in terminal: update-grub
    7. exit (to end the root shell)

    I found it here: Dell Studio 1569 Cannot Shutdown in Ubuntu 11.10 or 12.04

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