Power Management
Item | Specification |
|
|
Power management standard | ACPI 1.0b/2.0/3.0 |
|
|
System power management states | Mechanical Off (G3) – All system devices are turned off |
| completely. |
| Soft Off (G2/S5) – OS initiated shutdown. All devices |
| in the system are turned off completely. |
| Working (G0/S0) – Individual devices such as the |
| processor and hard disk may be power managed in |
| this state. |
| S3 Sleeping State |
| CPU set power down |
| VGA suspend |
| Audio power down |
| Hard disk power down |
| Optical drive power down |
| Card reader function suspend |
| S4 Sleeping State (hibernation mode) – All system |
| states and data are saved onto disk before power |
| shutdown. The same session is restored the next time |
| the system is powered on. |
|
|
Processor power management states | To further conserve power in a Working state, the |
| processor enters a |
| C1 state – CPU halt instruction |
| C2 state – CPU stop grant state |
| C3 state – CPU stop clock state |
|
|
Chapter 1 | 101 |
