Enabling Power off in Ubuntu 13.10 on HP EliteBook
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"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor acpi=force"
Update the GRUB with new config:
And after a restart: Hey presto! I can now turn off my computer.