For me the "force" options doesn't work - it doesn't change anything.
I think the bug is related somehow with xserver, because when I didn't start the xserver, then the "reboot" and "shutdown" have worked correctly.
My boot options: boot/vmlinuz-2.6.15-18-amd64-generic root=/dev/hda11 ro console =tty0 noapic noapci acpi=force quiet splash
For me the "force" options doesn't work - it doesn't change anything.
I think the bug is related somehow with xserver, because when I didn't start the xserver, then the "reboot" and "shutdown" have worked correctly.
My boot options: 2.6.15- 18-amd64- generic root=/dev/hda11 ro console
boot/vmlinuz-
=tty0 noapic noapci acpi=force quiet splash