Thus, StorAHCI also needs to control transitions to Slumber. HIPM-only was chosen because StorAHCI controls DEVSLP transitions directly and typically DEVSLP-capable controllers indicate that DEVSLP can only be reached through the Slumber state. StorAHCI allows the controller to handle transitions from Active to Partial by enabling the “Aggressive Partial feature” of the SATA-I/O standard.Īfter the device enters D3, StorAHCI will immediately transition the link to Slumber.
When the device is in D0, after the link has been in Partial for 100ms, StorAHCI will transition to Slumber. HIPM/DIPMīy default, HIPM-only is enabled and StorAHCI manages Partial to Slumber transitions. This section details how Microsoft’s in-box SATA driver (StorAHCI) manages power and what configuration options are available.
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