Using ACPI with
acpiprt(4) disabled doesn't sound like an overly good idea, have you tried disabling ACPI entirely?
You haven't posted a
dmesg(1) either, some people appreciate those.. you probably should have done that on your mailing list post as well.
Sending the results of
acpidump(8) to a developer is also a good idea, hopefully they can fix ACPI on your laptop.