Summary

In this chapter, we have learned to manage the power consumption of the system, both from within the code in the driver as from the user space with the command line), either at runtime by acting on individual devices, or by acting on the whole system by playing with sleep states. We have also learned how other frameworks can help to reduce the power consumption of the system (such as CPUFreq, Thermal, and CPUIdle).

In the next chapter, we will move onto PCI device drivers, which deal with the devices sitting on this famous bus that needs no introduction.