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4/8/2010
IOCTL_POWER_CAPABILITIES queries device-specific characteristics, including latency, power consumption, system wake, and inrush, from the device driver during Plug-and-Play enumeration. The device driver also reports which device power states it supports in its response to this IOCTL.
Power Manager generally does not request that a device go into a power state that it does not support. However, a driver developer should not assume such requests will not occur. Because a Windows Embedded CE-based device OEM can customize Power Manager, the OEM can choose to ignore the DeviceDxfield of the POWER_CAPABILITIESstructure.