Methods for providing power to an information handling system upon receiving a hot plug detect signal from a video display

An information handling system (IHS) comprising:

• a video display in communication with the IHS via a cable configured to carry display information from the IHS to the video display;
• the video display being capable of generating a hot plug detect signal having a given duration when powered-on and communicating the hot plug detect signal via the cable;
• an add-on graphics adapter within the IHS to receive the hot plug detect signal from the video display;
• the graphics adapter having capacity to determine relative to the power state of the IHS that the hot plug detect signal is a response to a power-on signal for the video display;
• and
• a power switch, responsive to the graphics adapter, to power on the IHS by sending a power request signal to a power controller of the IHS.

A method for powering on an information handling system (IHS), the method comprising:

• powering on a video display in communication with the IHS via a cable configured to carry display information from the IHS to the video display, wherein the IHS is in a power state of S3, S4, or S5;
• generating a hot plug detect signal in response to powering on the video display;
• sending the hot plug detect signal to a graphics adapter of the IHS via the cable;
• receiving by the IHS the hot plug detect signal from the video display;
• determining, by the graphics adapter, that the hot plug detect signal is a response to a power-on signal for the video display;
• and
• powering on the IHS by sending a power request signal to a power controller of the IHS as a response to determining that the hot plug detect signal is the response to the power-on signal for the video display.