Note for 5.2-Release:

ACPI does not work, it's probably a BIOS problem and I have the newest
BIOS that's available.

It fails with 

acpi0: <AMIINT > on motherboard
    ACPI-0168: *** Error: Could not transition to ACPI mode.
acpi0: Could not enable ACPI: AE_NO_HARDWARE_RESPONSE

when probing for ACPI during the boot phase.