Asus MAXIMUS VIII EXTREME User Manual page 54

ACPI/ASL Checkpoints
Code Description
0x01 System is entering S1 sleep state
0x02 System is entering S2 sleep state
System is entering S3 sleep state
0x03
System is entering S4 sleep state
0x04
System is entering S5 sleep state
0x05
System is waking up from the S1 sleep state
0x10
System is waking up from the S2 sleep state
0x20
System is waking up from the S3 sleep state
0x30
System is waking up from the S4 sleep state
0x40
0xAC System has transitioned into ACPI mode. Interrupt controller is in PIC mode.
0xAA System has transitioned into ACPI mode. Interrupt controller is in APIC mode.
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Chapter 1: Product Introduction