Power and Signal Distribution
7.3.3 Power Management
These systems include power management functions designed to conserve energy. These functions are provided by a combination of hardware, firmware (BIOS) and software. The system provides the following power management support:
■ACPI v2.0 compliant (ACPI modes C1, S1, and
■APM 1.2 compliant
■U.S. EPA Energy Star 3.0 and 4.0 compliant
Table
Table
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| Power |
| Power | Transition | OS Restart |
| State | System Condition | Consumption | To S0 by [2] | Required |
G0, S0, D0 | System fully on. OS and | Maximum | N/A | No |
| application is running, all |
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| components. |
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G1, S1, C1, D1 | System on, CPU is executing and | Low | < 2 sec after | No |
| data is held in memory. Some |
| keyboard or |
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| peripheral subsystems may be on |
| pointing device |
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| low power. Monitor is blanked. |
| action |
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G1, S2/3, C2, | System on, CPU not executing, | Low | < 5 sec. after | No |
D2 (Standby/or | cache data lost. Memory is |
| keyboard, pointing |
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suspend) | holding data, display and I/O |
| device, or power |
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| subsystems on low power. |
| button action |
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G1, S4, D3 | System off. CPU, memory, and | Low | <25 sec. after | Yes |
(Hibernation) | most subsystems shut down. |
| power button |
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| Memory image saved to disk for |
| action |
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| recall on power up. |
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G2, S5, D3cold | System off. All components either | Minimum | <35 sec. after | Yes |
| completely shut down or receiving |
| power button |
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| minimum power to perform system |
| action |
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G3 | System off (mechanical). No power | None | — | — |
| to any internal components except |
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| RTC circuit. [1] |
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NOTES:
Gn = Global state.
Sn = Sleep state.
Cn = ACPI state.
Dn = PCI state.
[1]Power cord is disconnected for this condition.
[2]Actual transition time dependent on OS and/or application software.
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