Maximum power savings = The system attempts to use the L1 state when the link is idle. Moderate power savings = The system attempts to use the L0 state when the link is idle. Users can specify the following ASPM policies below: The difference between these 2 options are the power savings versus the latency (Time to recover from the Sleep state).
There are basically 2 levels of power management in the PCI Express options. The hardware is automatically converted to L0 again when data is available to transfer across the link. The link state of a PCIe device is converted from L0 (on) to L1 (off) when the link is not transferring data. Link State Power Management is a part of the PCI Express Power Management Settings in Power Options that allows users to specify the Active State Power Management (ASPM) policy to use for capable links when the link is idle.
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