ACPI power states

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ACPI state Intel state Apple state Description Apple enable signal Power well Since platform
G3 G3 G3C Mechanical off Always on with coin cell battery, main battery or AC adapter *RTC
G3H Always on with main battery or AC adapter *_G3H
S5 S5 S5 Soft off SMC_PM_G2_EN, not asserted when off on battery only *_S5
DeepSx SUS Low power sleep state PM_SLP_SUS_L *_SUS 6-series chipset (Sandy Bridge)
S4 S4 S4 Hibernation (Suspend to disk) PM_SLP_S5_L *_S4
S3 S3 S3 Standby (Suspend to RAM) PM_SLP_S4_L *_S3
S0 S0 S0 On PM_SLP_S3_L *_S0
S0i3 S0I3 Processing instructions PM_SLP_S0_L CPU VCore 100-series chipset (Skylake)

https://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interface#Power_states