Doug Henderson wrote:
The 1637 shows this message in dmesg:ACPI: BIOS age (2000) fails cutoff (2001), acpi=force is required to enable ACPIThe later kernels, including 1654, do not show this message. They appears to enable ACPI in both SMP and non-SMP versions.
ISTR that the ACPI cut-off date has now been dropped ...