57
Onboard LEDs
ACPI States Codes
The following codes appear after booting 
and the operating system into ACPI 
modes.  
01 System is entering S1 sleep state
02 System is entering S2 sleep state
03 System is entering S3 sleep state
04 System is entering S4 sleep state
05 System is entering S5 sleep state
10
System is waking up from the S1 sleep 
state
20
System is waking up from the S2 sleep 
state
30
System is waking up from the S3 sleep 
state
40
System is waking up from the S4 sleep 
state
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.