MSI H55M User Guide - Page 50
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▍ BIOS Setup Power Management Setup Important S3-related functions described in this section are available only when the BIOS supports S3 sleep mode. ▶ ACPI Function This item is to activate the ACPI (Advanced Configuration and Power Management Interface) Function. If your operating system is ACPI-aware, such as Windows 98SE/ 2000/ ME/ XP, select [Enabled]. ▶ ACPI Standby State This item specifies the power saving modes for ACPI function. If your operating system supports ACPI, such as Windows 2000/ XP, you can choose to enter the Standby mode in S1(POS) or S3(STR) fashion through the setting of this field. Settings are: [S1] The S1 sleep mode is a low power state. In this state, no system context is lost (CPU or chipset) and hardware maintains all system's context. [S3] The S3 sleep mode is a lower power state where the in formation of system configuration and open applications/files is saved to main memory that remains powered while most other hardware compo- nents turn off to save energy. The information stored in memory will be used to restore the system when a "wake up" event occurs. ▶ ErP 2013 This item is used to reduce the power consumption in ACPI S5 state. 3-12