ADLINK NuPRO-A40H - Manual (Page 58)

44 BIOS Setup
5.3.1 ACPI Settings
Enable APIC Auto Configuration
BIOS ACPI Auto Configuration. Options: Enabled/Disabled.
ACPI Sleep State
Select the highest ACPI sleep state the system will enter, when
the SUSPEND button is pressed. Options: S1, S3, Suspend
Disable.
AC Power Shutdown
ATX mode: OS will turn off system power when shutdown.
AT mode: OS show It is now safe to turn off your computer.
NOTE: NOTE:
AT mode will not support S3 & S4.