When the system wakes automatically, it broadcasts the PBT_APMRESUMEAUTOMATIC event to all applications. Instead the system returns to sleep based on the system idle timer. If the system wakes due to user activity, the system does not automatically return to sleep based on the unattended idle timer.Instead, the system returns to sleep based on the system idle timer. If the system wakes automatically, but the user provides new input while the event is handled, the system does not automatically return to sleep based on the unattended idle timer.
#System idle timer windows driver#
If the driver indicates user presence, then the system idle timer is used.
Device-based wakes trigger the unattended idle timer by default unless the device driver indicates user presence. If the system wakes automatically (that is, no user activity is present), it shuts down as soon as the unattended idle timer expires, assuming that no applications have called SetThreadExecutionState to indicate that the system is required. The following criteria determine whether the system returns to the sleep state: This time enables the system to return to the sleep state quickly after the computer is no longer required. This timer gives applications sufficient time to call the SetThreadExecutionState function to indicate that they are busy. When the system wakes automatically because of an event (other than power switch or user activity), the system automatically sets an unattended idle timer to at least 2 minutes. To specify that the system should wake when the timer is signaled, set the fResume parameter to TRUE. The pDueTime parameter specifies when the timer will be signaled. To set the timer, use the SetWaitableTimer function. To create the object, use the CreateWaitableTimer function. Use a waitable timer object to specify the time at which the system should wake. Your application can restore a computer that is in a sleep state to the working state by using a scheduled timer or a device event. 
For wakes from Modern Standby (S0 Low Power Idle), please refer to transitioning between idle and active states. The following information applies to wakes from sleep (S3) and hibernate (S4).
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