As directed by Matthew Garret, I pulled the ubuntu-hardy git kernel source, and 
added a printk to acpi_early_init in drivers/acpi/bus.c, like so:
...
        status =
            acpi_enable_subsystem(~
                                  (ACPI_NO_HARDWARE_INIT |
                                   ACPI_NO_ACPI_ENABLE));
        printk("Successfully enabled ACPI\n");
        if (ACPI_FAILURE(status)) {
                printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
                goto error0;
        }
...
This did not alter the kernel output.

-- 
[regression] Asus F3Jm fails to work correctly without acpi=off
https://bugs.launchpad.net/bugs/184712
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