I know this thread is mega-old, but it worked like a charm for me on a new install of Mint 15 MATE 64-bit
My system would hang on shutdown. It would go through the "system is going down for a halt NOW! going to run level..." etc. and the screen would blank, but the computer would stay powered on (fans running, lights on) until manually holding the power button. After adding the above acpi_osi=Linux, halt works as expected!
A couple things though:
I recommend creating a backup of important files (any file you need to sudo edit) before editing
Code: Select all
sudo cp /etc/default/grub /etc/default/grub_bkup
and I noticed that immediately after updating the grub file, the computer still hung when trying a halt - the update didn't take effect until after a full reboot.
Thanks a million!