ACPI(4) describes debug.acpi.disabled but does not mention apei in the list of ACPI sub-devices and features. Stable/12 currently has a bug that requires disabling apei until the fix migrates from head. This is related to https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248746
Created attachment 228772 [details] acpi(4) patch Mention that if debug.acpi.disabled is set to apei, ACPI Platform Error Interface will be disabled.