Some machines, including ThinkPad T61, emit the following error message
early during boot:

CPU0: local APIC error 0x40

The message itself doesn't seem to be much of a problem.  However,
every once in a while booting hangs just before that line.  I've tracked
that down to call to AcpiHwWritePort() at

    switch (Mode)

        /* BIOS should have disabled ALL fixed and GP events */

        Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
                        (UINT32) AcpiGbl_FADT.AcpiEnable, 8);

Any idea what might be going on?

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