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?
I have the same problem and found a solution which worked out for me.
Type in terminal:
EDITOR=gedit sudoedit /etc/default/grub- Find the line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" - Change this to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force" - Save the file and close the file.
- Finally, in terminal:
sudo update-grub -
exit(to end the root shell)
I found it here: Dell Studio 1569 Cannot Shutdown in Ubuntu 11.10 or 12.04
Another possible solution - especially for newer hardware using (U)EFI - is to add the boot parameter apm=power_off. You can add it to the definition of GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub or add the line if it does not exist yet.
GRUB_CMDLINE_LINUX_DEFAULT="apm=power_off"
Then update the grub installation according to your operating systems manual, e.g: update-grub or grub2-mkconfig -o /boot/efi/EFI/[osname]/grub2.cfg or similar.
It is a bug. Ref - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/987933