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Chapter 3 Hardware
30 Reference Manual MightyBoard 821
Power-On LED if connected. Your system will take longer to wake-up in this sleep state, however, since
your data is saved to the disk, it is more secure and should not be lost in the event of a power failure.
♦
To enter a hibernate or suspend-to-disk state, the MightyBoard 821 must be fully powered on while
the OS transitions the MightyBoard 821 into this sleep state (S4) under user control.
♦
To exit this sleep state, typically pressing the power switch for less than 4 seconds (default) will
restore full operation.
• 5
th
state is the normal power off or shutdown (S5).
All activity stops, except the internal clock, if there is a backup battery installed. Removing the power
cord from the power source ensures all activity is stopped, except the internal clock.
♦
To go to a fully powered down state, the MightyBoard 821 must either be powered on, or in a sleep
state, and then the Power On/Off switch is pressed for more
than 4 to 6 seconds.
♦
To go to a fully powered up state, press the power switch for less than 4 seconds (default) and full
operation is restored.
The OS may provide additional programming features to change the activation time for each state, and to
shutdown or transition the MightyBoard 821 at certain times, depending on the way the OS interface is
programmed. Refer to the OS vender’s documentation for power management under the ACPI standard.