Patent ID: 8619193

Claim:
A communication apparatus comprising: an acquiring unit that acquires predetermined information from a display device if the display device is in a first state, wherein the first state is a state that the display device allows the communication apparatus to acquire the predetermined information; a first transmission unit that transmits data generated based on the predetermined information to the display device via a line; a first detecting unit that detects, using a Hot Plug Detect (HPD) signal, whether the display device is in a second state or the first state, wherein the second state is different from the first state; a second detecting unit that detects whether the line is connected to a terminal resistor of the display device; a second transmission unit that transmits a command to the display device, wherein the command is used for changing a state of the display device to a power on state; and a control unit that causes the second transmission unit to transmit the command to the display device, after the second detecting unit detects that the line is not connected to the terminal resistor and the first detecting unit detects that the display device is in the first state, wherein the control unit causes the first transmission unit to transmits data generated based on the predetermined information to the display device via the line, after the command is transmitted to the display device, the second detecting unit detects that the line is connected to the terminal resistor, and the first detecting unit detects that the display device is in the first state, and wherein the predetermined information includes Extended Display Identification Data (EDID) or Enhanced EDID.