Acer TravelMate 4220 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 135

Power Management Item Power management standard System power management states Processor power management states Specification ACPI 1.0b/2.0/3.0 T Mechanical Off (G3) - All system devices are turned off completely. T Soft Off (G2/S5) - OS initiated shutdown. All devices in the system are turned off completely. T Working (G0/S0) - Individual devices such as the processor and hard disk may be power managed in this state. T S3 Sleeping State T CPU set power down T VGA suspend T Audio power down T Hard disk power down T Optical drive power down T Card reader function suspend T 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. To further conserve power in a Working state, the processor enters a low-power state when the OS is idle. T C1 state - CPU halt instruction T C2 state - CPU stop grant state T C3 state - CPU stop clock state Appendix C 125