Acer 4520 - page 135

Appendix C 125
Power Management
Item Specification
Power management standard ACPI 1.0b/2.0/3.0
System power management states TMechanical Off (G3) – All system devices are turned off
completely.
TSoft Off (G2/S5) – OS initiated shutdown. All devices
in the system are turned off completely.
TWorking (G0/S0) – Individual devices such as the
processor and hard disk may be power managed in
this state.
TS3 Sleeping State
TCPU set power down
TVGA suspend
TAudio power down
THard disk power down
TOptical drive power down
TCard reader function suspend
TS4 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 low-power state when the OS is idle.
TC1 state – CPU halt instruction
TC2 state – CPU stop grant state
TC3 state – CPU stop clock state
Acer TM 4520 SG.book Page 125 Friday, June 22, 2007 5:43 PM