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A large part of power dissipation in a system is generated by I/O devices. Increasingly these devices provide power
saving mechanisms to inter alia enhance battery life. While I/O device scheduling has been studied in the past for
realtime systems, the use of energy resources by these scheduling algorithms may be improved. These approaches are
crafted considering a huge overhead of device transition. The technology enhancement has allowed the hardware
vendors to reduce the device transition overhead and energy consumption. We propose an intra-task device scheduling
algorithm for real time systems that allows to shut-down devices while ensuring the system schedulability. Our results
show an energy gain of up to 90% in the best case when compared to the state-of-the-art.