Intel SE7221BK1-E manual Wake up Sources Acpi and Legacy, Supported Wake Events, Usb

SE7221BK1-ETechnical Product Specification

Power Button On to Off (Legacy):

Power Button On to Off (ACPI):

supply through an inverter, and then transition to an ON state.

The ICH6 is configured to generate an SMI due to a power button event. The BIOS services this SMI and sets the state of the machine in the ICH6 and Super IO to the OFF state.

If an ACPI operating system is loaded, the power button switch generates a request (via SCI) to the OS to shutdown the system. The OS retains control of the system and determines what sleep state (if any) the system transitions to.

Reset Button:The reset button will generate a hard reset to the system.

NMI Button:The NMI button will force an NMI to the processors.

6.1.2Wake up Sources (ACPI and Legacy)

The baseboard is capable of wake up from several sources under a non-ACPI configuration, such as when the operating system does not support ACPI. The wake up sources are defined in the following table.

Table 15. Supported Wake Events

Wake Event	Supported via ACPI	Supported Via Legacy Wake
	(by sleep state)
Power Button	Always wakes system	Always wakes system
PME from PCI 32/33	S1, S4	S5
PME from primary PCI 64/66	S1, S4	S5
RTC Alarm	S1, S4	No
Mouse	S1	No
Keyboard	S1	No
USB	S1	No

Under ACPI, the operating system programs the ICH6R and Super IO to wake up on the desired event, but in legacy mode, the BIOS enables/disables wake up sources based on an option in BIOS Setup. The operating system or a driver must clear any pending wake up status bits in the associated hardware (such as the Wake on LAN status bit in the LAN application specific integrated circuit (ASIC), or PCI Power Management Event (PME) status bit in a PCI device. The legacy wake up feature is disabled by default.

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