Power Management Substates

A set of new features define new S0ix substates that provide lower power at a higher exit latency cost and, in some cases, fewer allowed wake events. The substates are denoted by suffixes appended to the S0i2 base name. The highest suffix number indicates the deepest substate. On Intel^® Core™ Ultra Processor, the supported suffixes are S0i2.0, S0i2.1, S0i2.2. During the transition between S0 and Sx, the S0ix Substates logic is reconfigured to work in Sx.

S0ix in Sx

All the power saving features of S0ix are activated in Sx as well.

Naming Convention

The naming convention: S*ix.y refers to any combination of S0/Sx and Substate.

Specifically:

• * represents any S0-Sx state (e.g., S0, S4, S5)
• x represents any S0ix State (e.g., S0i2)
• y represents any Substate (e.g., .0, .1, .2, )

For example, to represent the "2.0" equivalent substate in any S0 or Sx state, use the naming S*i2.0