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This section describes about the Active State Power Management (ASPM).
ASPM is the power management capability of hardware to effectively reduce usage of power by placing the PCI Express(PCIe) based serial link devices to low-power state when not in use.
ASPM is controlled by BIOS or the power management component of the operating system in two configurations.
The PCIe bus must be woken up from low-power mode to re-establish the connection with the device. This accounts for the latency, which is also referred to as ASPM exit latency.