System to enable display detect and method therefor
A method may include executing basic input/output system (BIOS) instructions to initialize an information handling system. The initialization may include generating a hot-plug detect (HPD) override request. The method may further include receiving the HPD override request at a general purpose input/output (GPIO) device. In response to receiving the HPD override request, the GPIO may assert an active-low signal at an interconnect electrically connected to a HPD terminal of a graphics display receptacle, the receptacle for coupling a graphics processing unit to a graphics display device.
1. An information handling system comprising:
a display receptacle to couple the information handling system to a graphics display device, the receptacle including a hot-plug detect (HPD) terminal configured to receive an HPD signal from the graphics display device;
a general purpose input/output (GPIO) device, an output of the GPIO device electrically coupled to the HPD terminal; and
a central processing unit (CPU) to execute basic input/output system (BIOS) instructions, the BIOS instructions to configure the GPIO to assert an active-low signal at an interconnect electrically connected to the HPD terminal.
2. The information handling system of claim 1 , further comprising an embedded controller (EC), and wherein the GPIO is included at the EC.
3. The information handling system of claim 1 , further comprising a chipset functionally coupled to the CPU, and wherein the GPIO is included at the chipset.
4. The information handling system of claim 1 , further comprising an integrated graphics processing unit (GPU), the integrated GPU coupled to the display receptacle.
5. The information handling system of claim 1 , further comprising a BIOS configuration setup interface, the interface including an option to enable and disable configuring the GPIO to assert the active-low signal.
6. The information handling system of claim 1 , wherein the display receptacle is a Display Port receptacle.
7. The information handling system of claim 1 , wherein the display receptacle is a High-Definition Multimedia Interface receptacle.
8. The information handling system of claim 1 , wherein the GPIO is configured to discontinue the assertion of the active-low signal prior to handing control of the information handling system to an operating system.
9. The information handling system of claim 1 , wherein the GPIO is configured to discontinue the assertion of the active-low signal after the BIOS transfers control of the information handling system to an operating system.
10. A method comprising:
executing basic input/output system (BIOS) instructions to initialize an information handling system, the initialization including generating a hot-plug detect (HPD) override request;
receiving the HPD override request at a general purpose input/output (GPIO) device; and
in response to receiving the HPD override request, asserting an active-low signal at an interconnect electrically connected to an HPD terminal of a graphics display receptacle, the receptacle for coupling a graphics processing unit to a graphics display device.
11. The method of claim 10 , wherein the GPIO is included at an embedded controller.
12. The method of claim 10 , wherein the GPIO is included at a chipset.
13. The method of claim 10 , wherein the display receptacle is coupled to an integrated graphics processing unit included at the information handling system.
14. The method of claim 10 , wherein the information handling system provides a BIOS configuration setup interface, the interface including an option to enable and disable configuring the GPIO to assert the active-low signal.
15. The method of claim 10 , wherein the GPIO is configured to discontinue the assertion of the active-low signal prior to handing control of the information handling system to an operating system.
16. The method of claim 10 , wherein the GPIO is configured to discontinue the assertion of the active-low signal after the BIOS transfers control of the information handling system to an operating system.
17. A circuit board comprising:
a graphics processing unit (GPU);
a display receptacle to couple the GPU to a graphics display device, the receptacle including a hot-plug detect (HPD) terminal configured to receive an HPD signal from the graphics display device;
a general purpose input/output (GPIO) device, an output of the GPIO device electrically coupled to the HPD terminal; and
a central processing unit to execute basic input/output system (BIOS) instructions, the BIOS instructions to configure the GPIO to assert an active-low signal at an interconnect electrically connected to the HPD terminal.
18. The circuit board of claim 17 , further comprising an embedded controller (EC), wherein the GPIO is included at the EC.
19. The circuit board of claim 17 , further comprising a chipset functionally coupled to a central processing unit, wherein the GPIO is included at the chipset.
20. The circuit board of claim 17 , wherein the GPU is an integrated GPU permanently installed at the circuit board.