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DisplayBlanking =============== While <preventBlanking> == true in any DisplayBlanking object, keeps the system from automatically blanking the display. The application must set <preventBlanking> = false when blanking is again to be allowed. Example use case: Video player * the display is on due to user activity * video playback is started * video player sets <preventBlanking> = true * video playback is paused/stopped * video player sets <preventBlanking> = false The current visibility of the display is given by DisplayBlanking.status and can be one of: - DisplayBlanking.On - DisplayBlanking.Dimmed - DisplayBlanking.Off - DisplayBlanking.Unknown This can be used to disable updates while the display is off, for example. PeriodicBackgroundProcessing ============================ When <enabled> == true, wakes the process every <interval> seconds - even if the system has entered late suspend. The application can specify the wakeup <interval>, but do note that it is subject to rounding done at the IPHB daemon (currently part of DSME). Application is notified of the wakeup via <activeChanged> signal. NOTE: The <activeChanged> signal handler must not block. The application must check that <active> == true before starting processing, and must set it back to false after finishing to allow normal suspend policy to take effect. Example use case: RSS reader * sets the <interval> = 600 [10 minutes] * sets <enabled> = true * at the next 10 global wakeup slot time the <activeChanged> is signaled and the system is blocked from going in to late suspend * after finishing the RSS feed updating the app sets <active> = false * the system can suspend (unless some other policy is blocking it) * at the next 10 global wakeup slot time the cycle repeats