Asus Z170-WS Manual page 42

ACPI/ASL Checkpoints (under OS)
Code Description
03 System is entering S3 sleep state
04 System is entering S4 sleep state
05 System is entering S5 sleep state
30 System is waking up from the S3 sleep state
System is waking up from the S4 sleep state
40
AC System has transitioned into ACPI mode. Interrupt controller is in PIC mode.
AA System has transitioned into ACPI mode. Interrupt controller is in APIC mode.
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Chapter 1: Product Introduction