Foxconn Q45M Series User Manual page 32

S2 - The S2 sleeping state is a low wake latency sleeping state. This state is similar to the S1
sleeping state except that the CPU and system cache context is lost (the OS is respon-
sible for maintaining the caches and CPU context). Control starts from the processor's
reset vector after the wake event.
S3 - The S3 sleeping state is a low wake latency sleeping state where all system context
is lost except system memory. CPU, cache, and chip set context are lost in this state.
Hardware maintains memory context and restores some CPU and L2 configuration con-
text. Control starts from the processor's reset vector after the wake event. (also called
Suspend to RAM)
S4 - The S4 sleeping state is the lowest power, longest wake latency sleeping state supported
by ACPI. In order to reduce power to a minimum, it is assumed that the hardware plat-
form has powered off all devices. Platform context is maintained. (also called Suspend
to Disk)
S5 - The S5 state is similar to the S4 state except that the OS does not save any context. The
system is in the "soft" off state and requires a complete boot when it wakes. Software
uses a different state value to distinguish between the S5 state and the S4 state to allow
for initial boot operations within the BIOS to distinguish whether or not the boot is going
to wake from a saved memory image.
► ACPI Suspend Type
This item is used to set the energy saving mode of the ACPI function. When you select "S1
(Power on Suspend)" mode, the power is always on and computer can be resumed at any
time. When you select "S3 (Suspend to RAM)" mode, the power will be down after a period
of time. The status of the computer before it entering STR will be saved in memory, and the
computer can quickly return to previous state when the STR function wakes.
► Wake Up By PCI Card
This item is used to set the system to wake up by PCI card.
► Wake Up By PCI-E Card
This item is used to set the system to wake up by PCI-E card.
► Wake Up By USB KB/MS
This item is used to set the system to wake up by USB keyboard or mouse.
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