1. A portable device, comprising: a power module, configured to provide electric power; a processing module, electrically coupled to the power module and configured to perform an operating system to drive the portable device when being enabled; a sensing module, configured to sense a gesture to generate a set of touch sensing signals when being enabled, wherein it is determined that the set of touch sensing signals corresponds to a set of preset signals and the sensing module generates an operating system start-up signal when a difference between a first scaled track corresponding to the set of touch sensing signals and a second track corresponding to the set of preset signals is within a preset range; based on a determination that the difference between the first scaled track and the second track is not within the preset range, determining whether an error count is less than a preset value, the error count indicating a number of times the difference between the first scaled track and the second track is within the preset range, and based on a determination that the error count is less than the preset value, adjusting a position and scale of the first scaled track; and an enabling control module, electrically coupled to the sensing module, the power module, and the processing module, configured to set a first power path between the power module and the sensing module according to a switching signal to conduct electricity to enable the sensing module and to set a second power path between the power module and the processing module to conduct electricity to enable the processing module when receiving the operating system start-up signal; wherein when the first power path is set to conduct electricity to enable the sensing module and the set of touch sensing signals does not correspond to the set of preset signals, the second power path is not set to conduct electricity.