Intel D845GLLY D845GL_Boards_TechProdSpec - Page 32
System States and Power States
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Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 1.12.1.1 System States and Power States Under ACPI, the operating system directs all system and device power state transitions. The operating system puts devices in and out of low-power states based on user preferences and knowledge of how devices are being used by applications. Devices that are not being used can be turned off. The operating system uses information from applications and user settings to put the system as a whole into a low-power state. Table 11 lists the power states supported by these Desktop Boards along with the associated system power targets. See the ACPI specification for a complete description of the various system and power states. Table 11. Power States and Targeted System Power Global States Sleeping States Processor States Device States Targeted System Power (Note 1) G0 - working state G1 - sleeping state G1 - sleeping state G1 - sleeping state G2/S5 G3 - mechanical off AC power is disconnected from the computer. S0 - working S1 - Processor stopped S3 - Suspend to RAM. Context saved to RAM. S4 - Suspend to disk. Context saved to disk. S5 - Soft off. Context not saved. Cold boot is required. No power to the system. C0 - working C1 - stop grant No power No power No power D0 - working state. D1, D2, D3 - device specification specific. D3 - no power except for wake-up logic. D3 - no power except for wake-up logic. D3 - no power except for wake-up logic. Full power > 30 W 5 W < power < 52.5 W Power < 5 W (Note 2) Power < 5 W (Note 2) Power < 5 W (Note 2) No power D3 - no power for wake-up logic, except when provided by battery or external source. No power to the system. Service can be performed safely. Notes: 1. Total system power is dependent on the system configuration, including add-in boards and peripherals powered by the system chassis' power supply. 2. Dependent on the standby power consumption of wake-up devices used in the system. 32
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