Unless your BIOS also happens to support APM, you should not be running with ACPI disabled for any length of time. ACPI controls your cooling; your processor may overheat. Your dmesg will tell you if APM is available, only if it does not find ACPI support or if ACPI is disabled.
(OpenBSD can use either ACPI or APM for fan management. Machines built during the ACPI transition years will have both.)
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