unattaching the power cable cause laptop could not shutdown

[Kemian Dang]

Hi, there.

I am running FB7-rc1 on a HP/Compaq laptop. I find if I unplug the
power cable and let it use the battery, it will become slow, and
recover when plug in the power cable. But when I shutdown the
computer, it will halt on the first stage and can not be shutdown.
I think it maybe the ACPI problem, but if I disable the ACPI, the box
can not be boot.

Any suggestion is welcomed.

Kemian