Sleep And Wake Functionality; On To Off (Operating System-Present) Or Operating System To Sleep - Intel SE7520AF2 Technical Product Specification

Intel® Server Board SE7520AF2 TPS
The system can wake from the S1 state using a PS/2 keyboard, mouse, and USB device in
addition to the sources described above.
The wake-up sources are enabled by the ACPI operating systems with co-operation from the
drivers; the BIOS has no direct control over the wakeup sources when an ACPI operating
system is loaded. The role of the BIOS is limited to describing the wakeup sources to the
operating system and controlling secondary control/status bits via DSDT table.
S5 state is equivalent to operating system shutdown. No system context is saved.
5.17.3

Sleep and Wake Functionality

The BIOS supports up to four front panel buttons: the power button, the reset button, the sleep
button, and the NMI button
all front panel designs.
The power button is a request that is forwarded by the BMC to the ACPI power state machines
in the chipset. It is monitored by the BMC and does not directly control power on the power
supply.
The BIOS supports a front panel NMI button. The NMI button is a request that causes the BMC
to generate an NMI (non-maskable interrupt). The operating system is responsible for handling
the NMI core dump.
The power button behaves differently depending on whether the operating system supports
ACPI. If the operating system supports ACPI the power button can be configured as a sleep
button. The operating system causes the system to transition to the appropriate system state
depending on the user settings.
5.17.4

On to Off (operating system-Present) or operating system to Sleep

If an operating system is loaded, the power button switch generates a request via the system
control interrupt (SCI) to the operating system to shutdown the system. The operating system
retains control of the system and operating system policy determines if the system transitions
into S4/S1 or shuts down.
5.17.5 Sleep to On (ACPI)
If an operating system is loaded, the power button or Wake on LAN (WOL) can generate a wake
event to the ACPI chipset and a request (via SCI). If system wakes up from S4/S5, the BIOS
POST is completed and then control is given to operating system to wake up the system. If
wakeup is from S1, the operating system will wake up the system.
5.17.6 System Sleep States
The platform supports the following ACPI System Sleep States:
−
ACPI S0 (working) state
−
ACPI S1 (sleep) state
1
Rack mount configurations may have a fifth button (ID) which is supported by hardware.
Revision 1.2
1 . The NMI button is a recessed button and may not be accessible on
Intel order number C77866-003
System BIOS
147