Shutdown hangs at: "ACPI_power_off_called".

[Darren Critchley]

Bill Stoye wrote:

><SNIP>
>

>I added "noapic", it wouldn't shut down. (tried twice)
>When I added "pci=noacpi" and "acpi=off", boot hung at the following
>line: "ohci_hcd: block sizes: ed 64 to 64"; there were a lot of strange
>messages I didn't recognize that streamed by, including segmentation
>fault and a number of failure/error messages.
>Bill
>  
>
I was having a similar problem with my IBM Thinkpad, it was resolved 
with the following

acpi=force

Note it is case sensitive. After reading the dmesg, I found that Ubuntu 
was not starting the acpi because my bios was older than 1999. Adding 
that option fixed that and now it shuts down properly.

Darren