HP Spectre x360 Convertible 15-ch0xx not using discrete graphics on external monitor

[Aaron_G]

Good afternoon, 

The problem I am experiencing is coming from the use of my graphics card on an external monitor. 

I have found that when I connect to the monitor, it is only using the integrated Intel graphics from the cpu.

I have tried disabling the integrated gpu to force my laptop to use the Radeon RX Vega M GL graphics, but when I do so, nothing will display on my monitor. (I have tried connecting through HDMI port and USB-c port)

I have updated my drivers and all other software.

Any help is appreciated, thanks!

[Riddle_Decipher]

@Aaron_G The dedicated/discrete GPU is system managed and cannot be changed or set as default manually, there are a few tweaks that could be made using the steps in this link: click here to explore, that said, if you've confirmed that one of the two GPU's isn't working, you may want to perform a hardware test to identify hardware malfunction and we could work on repairing or replacing the GPU that no longer works:

Install the latest version of the HP Hardware diagnostics (UEFI) on your device using this link: Click here for details

• Hold the power button for at least five seconds to turn off the computer.
• Turn on the computer and immediately press Esc repeatedly, about once every second. When the menu appears, press the F2 key.
• On the HP PC Hardware Diagnostics (UEFI) main menu, click System Tests.
• Click Extensive Test.
• Click Run once, or Loop until error.
• While the test is running, the time remaining and test result for each component display on the screen.
  • If a component fails a test, write down the failure ID (24-digit code) for when you respond back to us.

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