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Enabling Power off in Ubuntu 13.10 on HP EliteBook

Published 2013-10-18 (Modified 2013-10-20)

After enabling the brightness option on my spanking new Ubuntu 13.10 installation on my HP EliteBook, I discovered I had to do some more GRUB editing. Because when I tried to shut down my computer, I discovered that the shut down option in the Ubuntu menu did nothing, and I had to shut the computer down by the shutdown command in treminal.

sudo shutdown -d now

And, as the brightness option was, this was something that needed to be enabled.  And again, something had to be added to the GRUB_CMDLINE_LINUX_DEFAULT variable.

So to edit the GRUB config:

sudo nano /etc/default/grub

And add acpi=force to GRUB_CMDLINE_LINUX_DEFAULT. So from this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

To this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor acpi=force"

Update the GRUB with new config:

sudo update-grub

And after a restart: Hey presto! I can now turn off my computer.