Patent ID: 8661280

Claim:
An information processing system, comprising: a host apparatus, serving as a master; a device, communicatively connected to the host apparatus and serving as a slave, the device being responsive to commands including operation commands for operating the device and inquiry commands from the host apparatus and being configured to establish a power-saving mode when no command is received from the host apparatus for a first prescribed time period; and a device driver, provided in the host apparatus, the device driver being configured to transit from a normal state to a suspended state when no operation command for operating the device is received for a second prescribed time period, wherein: the device driver returns a dummy response, when the device driver receives an inquiry command while the device driver is placed in the suspended state, without notifying the inquiry command to the device, and the device driver outputs a return command to the device for returning the device from the power-saving mode when the device driver receives a command other than the inquiry command while the device driver is placed in the suspended state.