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//0x4c bytes (sizeof)
struct _DEVICE_OBJECT_POWER_EXTENSION
{
    ULONG IdleCount;                                                        //0x0
    ULONG ConservationIdleTime;                                             //0x4
    ULONG PerformanceIdleTime;                                              //0x8
    struct _DEVICE_OBJECT* DeviceObject;                                    //0xc
    struct _LIST_ENTRY IdleList;                                            //0x10
    UCHAR DeviceType;                                                       //0x18
    enum _DEVICE_POWER_STATE State;                                         //0x1c
    struct _LIST_ENTRY NotifySourceList;                                    //0x20
    struct _LIST_ENTRY NotifyTargetList;                                    //0x28
    struct _POWER_CHANNEL_SUMMARY PowerChannelSummary;                      //0x30
    struct _LIST_ENTRY Volume;                                              //0x44
};