Examples for shutdown of computing devices (202) are described In an example, a shutdown event based on a shutdown criterion may be detected The shutdown criterion may be based on available power of an auxiliary power supply unit (304, 312) In response to detection of the shutdown event, a shutdown trigger to initiate shutdown of a computing device (202) powered by the auxiliary power supply unit (304, 312) may be generated. Further, the shutdown trigger may be provided to a remote management processor (218) of the computing device (202). The shutdown trigger may be provided based on port data (214), which indicates an outlet path from the auxiliary power supply unit (304, 312) to the at least one computing device.