Those numbers are a little deceiving.
What you have according to your HW report is an IBM NetVista 8305-52S.
Are you saying that when you enter setup (F1) you don't see a power management option?
You should. There are bios updates, manuals as well as service manuals for it at IBM's site.
A bios update may or may not address any acpi issue.
You will however notice a critical bios update affecting NetVista, ThinkCentre and Thinkpad systems with certain P4 and Celeron CPU's. The update is very specific and you will need the numbers off the CPU itself to see if you're affected.
What kind of problems are you having when configuring it via the OS?
A bios update would be a last resort.